English
聯系我們
網站地圖
郵箱
舊版回顧



大連化物所納米晶熱載流子弛豫動力學研究取得新進展

文章來源:大連化學物理研究所   發布時間:2019-05-10  【字號:     】  

  近日,中國科學院大連化學物理研究所光電材料動力學特區研究組研究員吳凱豐團隊采用飛秒瞬態光譜技術系統地研究了量子限域的鈣鈦礦納米晶的熱載流子弛豫動力學,發現該體系呈現出亞皮秒級別的熱載流子壽命與之前理論預測的“聲子瓶頸”機制不符,進一步研究發現熱載流子能量耗散通道由表面配體分子誘導的非絕熱弛豫機制所主導。相關成果發表于《化學科學》(Chemical Science)上。

  半導體中的光生載流子在與晶格(聲子)碰撞弛豫之前,具有顯著高于帶邊的能量,通常被稱為熱載流子。熱載流子的應用可使光伏器件的效率突破Shockley-Queisser極限,理論上可達到66%。然而,由于常見半導體中光生載流子與聲子間的散射發生于亞皮秒級別,熱電子的提取極為困難。有鑒于此,科學家們對可能產生長壽命熱載流子的各種機制進行了長期的探索。其中,半導體納米晶(或稱量子點)被預測具有長壽命的熱載流子,原因在于量子限域效應使得納米晶出現類原子的分立能級,這些能級間的能量差異高達幾百meV,使得熱載流子很難通過發射聲子的形式進行弛豫,被稱為“聲子瓶頸”現象。此外,近期也有報道稱鈣鈦礦光伏材料具有長壽命的熱載流子,因為這類材料“動態”的晶格結構可導致極化子的形成,從而屏蔽熱載流子與聲子間的散射。然而這一現象的存在與否尚存較大爭議。

  在該工作中,研究團隊合成了一系列量子限域的CsPbBr3鈣鈦礦納米晶,其中最小尺寸為2.6nm,是目前文獻報道限域效應最強的鈣鈦礦納米晶。科研人員采用態-態選擇激發的飛秒瞬態光譜,測定了不同尺寸納米晶中從第二到第一激發態的熱載流子弛豫時間,發現均處于亞皮秒量級,并未出現理論預測的“聲子瓶頸”現象;采用變溫和表面配體交換的實驗,也排除了多聲子發射和能量轉移等機制作為主要能量耗散通道的可能。研究團隊提出該體系的熱載流子弛豫可能由表面配體誘導的非絕熱躍遷機制所主導,并通過納米晶表面波函數計算進行了印證。具體而言,量子限域效應使得納米晶的電子波函數強烈地離域至納米晶表面,與表面配體分子的核運動發生非絕熱作用,從而誘導熱載流子在不同能級間的弛豫。納米晶尺寸越小,電子波函數在表面的幅度越大,與配體分子的非絕熱作用越強,從而導致越快的熱載流子能量耗散速率,這與實驗所測數據十分吻合。

  該工作首次研究了量子限域效應對鈣鈦礦納米晶熱載流子弛豫動力學的影響,揭示了非絕熱弛豫機制在其中的主導作用。同時,該工作也表明鈣鈦礦材料雖然表現出優異的光伏性能,但在熱載流子應用領域相比常見半導體材料并無明顯優勢,這對鈣鈦礦光伏器件具有指導意義。

  該工作得到中科院戰略性先導項目、國家重點研發計劃、國家自然科學基金等的資助。

 

大連化物所納米晶熱載流子弛豫動力學研究取得新進展




(責任編輯:葉瑞優)

附件:

專題推薦

相關新聞


© 1996 - 中國科學院 版權所有 京ICP備05002857號  京公網安備110402500047號  聯系我們

地址:北京市三里河路52號 郵編:100864

全民快乐8www.qmkl9.com 633901.com | 188shenbo.net | www.062291.com | 899387.com | www.29852.cc | www.pe80.cc | www.837216.com | www.101175.com | www.498077.com | www.983119.com | www.710426.com | www.914926.com | 68彩票www.68689i.com | 932115.com | www.921667.com | www.337038.com | www.95334.com | www.608208.com | www.kj97.com | www.85432.com | www.76519.com | www.553400.cc | www.523323.com | 305950.com | www.782969.com | www.cai888.com | www.9044.cn | 454915.com | www.460857.com | www.663954.com | www.qn22.com | www.59qs.com | www.26dm.com | www.291387.com | www.44pq.com | www.901445.com | mr63.com | www.zk70.com | www.668177.com | www.ss91.com | www.555698.com | www.cai1100.com | 633916.com | 604130.com | www.95rf.com | 034896.com | 乐彩赢www.0014p.com | www.9949.cc | www.31441.com | 226534.com | 150020.com | 053549.com | www.65058.com | www.226260.com | 众乐彩票www.389644.com | www.gx75.com | www.009280.com | www.22ju.com | 909468.com | www.77552.cc | www.281225.com | www.278311.com | www.820447.com | 940089.com | www.338808.com | www.147313.com | www.20409.cc | www.276508.com | www.73580.com | 407178.com | www.338770.com | 678006.com | 019413.com | 017841.com | 027160.com | 056516.com | www.2618.in | 929850.com | www.001853.com | www.fp98.com | www.8254.cm | www.566290.com | www.12442.com | www.27ro.com | www.20of.com | www.9918.top | www.327056.com | www.026453.com | 39彩票www.3933f.cc | www.pi75.com | www.g78.club | www.110631.com | www.401790.com | www.zd87.com | 493825.com | www.05892.com | 586314.com | www.8822.net | www.027093.com | www.496649.com | www.574.vip | 彩票驿站www.621421.com | www.256686.com | www.026789.com | www.2031.org | www.44870.com | www.817780.com | www.861280.com | 149808.com | 253838.com | 88彩票www.8839g.com | 网易彩票www.085wy.com | www.085098.com | www.373303.com | www.495171.com | www.433686.com | www.z80.pw | www.vr63.com | www.891075.com | www.91824.com | www.887623.com | www.at41.com | www.126801.com | 054051.com | www.936888.cc | 983614.com | www.315504.com | www.426755.com | www.672145.com | www.812403.com | www.89fn.com | www.8930.top | www.600123.cc | www.797037.com | 176358.com | www.665173.com | www.950807.com | 979041.com | www.609156.com | 506144.com | www.376457.com | www.507196.com | www.006853.com | www.121867.com | www.101111.com | www.127489.com | www.090718.com | www.102951.com | www.122865.com | www.266742.com | www.345125.com | www.318467.com | www.585033.com | www.603457.com | www.618433.com | www.581326.com | www.593055.com | www.876117.com | www.806200.com | www.840828.com | www.721234.cc | www.639036.com | www.552937.com | www.567342.com | www.534711.com | www.486725.com | www.502795.com | www.420073.com | www.315223.com | www.301745.com | www.180252.com | www.378767.com | www.309619.com | www.266365.com | www.188289.com | www.139414.com | www.068015.com | www.069802.com | www.015778.com | www.15399.cc | www.30vl.com | www.90be.com | www.3193.cn | www.98wf.com | www.18119.cc | www.739874.com | 70435.com--70435.com | www.917234.com | 954960.com | www.999934.com | www.949659.com | www.985213.com | 35222.com | 881794.com | www.257823.com | www.534883.com | www.652004.com | www.883886.com | www.9222.tv | www.396404.com | www.27rl.com | www.89586.cc | 633155.com | www.17kq.com | www.2129.wang | www.025850.com | www.997074.com | 355583.com | www.iw80.com | www.163406.com | www.47888.com | 182983.com | www.710875.com | www.751547.com | 267463.com | www.cp8848.com | www.62862.com | 038241.com | www.943259.com | www.004590.com | www.121132.com | www.599022.com | www.778101.com | www.133590.com | www.346456.com | www.566105.com | www.675652.com | www.777466.com | www.836696.com | www.874234.com | 465684.com | 949183.com | 606763.com | www.fv83.com | www.28bc.com | www.1001.cx | www.04608.com | www.020448.com | 2962.biz | www.805291.com | www.517565.com | www.5916.com | www.662331.com | 彩票500万www.207109.com | www.372638.com | www.978400.com | www.865325.com | www.789510.com | 500833.cc | www.020329.com | 6809.me | 362652.com | www.561664.com | www.54233.com | www.49818.com | www.17234.com | www.26777.com | www.51hz.com | www.35359.com | www.315087.com | www.499758.com | www.196026.com | www.874647.com | www.18101.com | www.514700.com | www.105268.com | www.27no.com | www.169376.com | www.960826.com | www.87ih.com | www.72912.com | www.579039.com | www.222328.com | www.hw28.com | www.22pe.com | www.28003.cc | www.7344.xyz | www.1445.vip | www.081351.com | www.357865.com | www.709565.com | www.44248.cc | www.215215.com | www.309809.com | www.85mn.com | www.056110.com | 341527.com | 761646.com | www.468525.com | www.00633.com | www.415100.com | www.89mj.com | www.pc73.com | 579740.com | www.4183.com | www.142325.com | 954417.com | www.1669.biz | www.415400.cc | www.850536.com | www.8211.wang | 11232.com | www.24hd.cc | www.324600.com | www.062024.com | www.182935.com | www.2068.vip | www.590695.com | www.994329.com | www.838075.com | 500彩票www.51515p.com | www.911677.com | 754954.com | www.792920.com | www.761901.com | www.821414.com | www.891789.com | www.749770.com | www.773472.com | www.207949.com | www.044811.com | www.079997.com | www.43gz.com | www.162951.com | 51kg.cc | www.836542.com | www.683921.com | www.01174.com | www.76771.com | www.407512.com | www.73828.cc | www.324276.com | 301267.com | www.146198.com | www.226053.com | www.85wb.com | www.079636.com | www.19138.cc | www.144642.com | www.81206.com | www.pj54.cc | www.cp9122.com | www.288267.com | www.871394.com | www.010000.cc | www.875402.com | www.2286.in | www.394620.com | www.17746.com | www.553606.com | www.603679.com | www.353565.com | www.46wc.com | 00yh.com | www.9315.online | www.72191.cc | www.195275.com | www.98tn.com | www.326603.com | 98re.com | 888955.com | www.244666.com | www.623222.cc | www.sh33.cc | www.692786.com | www.988338.com | 974658.com | www.252712.com | www.168528.com | 268506.com | www.33531.com | www.445758.com | 937777.com | fy94.com | 447601.com | www.680162.com | www.857092.com | www.897319.com | www.987335.com | www.13173.com | www.822667.com | 82244.com | 99771.com | www.357946.com | www.sv54.com | www.l10.in | www.63729.com | www.50699.cc | www.427960.com | 496209.com | www.288339.com | www.957203.com | www.990554.com | www.875631.com | www.99993.com | www.173317.com | www.3836.in | www.119538.com | www.359286.com | www.7945.biz | www.79906.com | www.91627.cc | www.95173.com | www.238710.com | www.257885.com | www.380693.com | www.738005.com | www.539228.com | www.747111.com | www.750850.com | www.50752.com | www.56832.cc | www.8328.in | www.028921.com | www.67390.com | www.322401.com | www.108464.com | www.33682.com | www.87vf.com | www.sw30.com | 500彩票网www.919509.com | 554012.com | www.930830.com | www.775550.com | www.731181.com | www.655303.com | www.530510.com | www.305262.com | www.065658.com | www.30100.cc | www.44qg.com | 恒大彩票www.299695.com | 189856.com | 天天彩票www.106316.com | 968940.com | www.089681.com | www.17888.cc | www.8800.online | www.72wd.com | www.jp87.com | yh32.cc | 04ni.com | 7026.biz | www.892014.com | www.777781.com | www.566474.com | www.293200.com | www.026994.com | www.1913.top | www.cp8928.com | 684168.com | 130309.com | www.949607.com | www.913596.com | www.677066.com | www.301520.com | www.088925.com | www.1461.vip | www.0240.in | www.54ig.com | 087189.com | 949261.com | www.71la.com | www.64qu.com | wz83.cc | 544364.com | www.914936.com | www.666206.com | www.426463.com | www.136588.com | www.020425.com | www.398996.com | www.352227.com | www.102872.com | www.266795.com | www.011694.com | www.88373.cc | www.75kv.com | www.8250.top | www.gt43.com | 947256.com | www.015540.com | www.983040.com | www.687057.com | 327226.com | www.203234.com | www.036420.com | www.555775.com | 357172.com | www.789314.com | www.903478.com | www.936581.com | www.817967.com | www.89sq.com | www.336760.com | www.820780.com | www.761950.com | www.791804.com | www.883602.com | www.cp3626.com | www.70760.com | www.663935.com | www.526351.com | www.vw50.com | www.7hd.cc | 9791.cc | www.475677.com | www.083953.com | www.910991.com | 500彩票www.50090.cc | 宝马彩票www.443300a.com | 凤凰彩票www.66652l.com | 博友彩www.866248.com | www.853834.com | www.7oc.com | www.go34.com | www.hd37.com | 356043.com | www.777550.com | 018195.com | www.054234.com | www.5436.in | www.82gh.com | www.355603.com | www.754898.com | www.220.cc | www.084277.com | www.537217.com | www.557846.com | 293136.com | www.380215.com | www.026414.com | www.226135.com | 918219.com | 244627.com | www.ja31.com | www.242698.com | www.85019.com | www.787472.com | www.iu66.com | www.4455.net | 150735.com | www.cp1499.com | www.cp985.com | www.206540.com | www.489822.com | www.xv0.cc | www.671155.com | www.930098.com | www.75mk.com | www.624215.com | 441130.com | cp0707.com | 88998.com | www.zn58.com | www.611985.com | 587219.com | www.901426.com | 563096.com | www.108758.com | www.2148.cm | www.dj93.com | www.256603.com | www.63728.com | www.203809.com | www.580170.com | www.827100.com | www.131254.com | www.509680.com | www.8855.live | www.688193.com | www.384911.com | www.6795.cc | www.8455.org | www.91br.com | www.791249.com | www.qo17.com | www.101687.com | www.114647.com | www.19337.cc | www.vg71.com | www.290606.com | www.540053.com | www.916101.com | www.004173.com | 662870.com | www.061221.com | www.55682.com | www.193977.com | www.479508.com | www.812797.com | 彩民网www.76520s.com | www.033038.com | www.590501.com | 306769.com | 245674.com | 597848.com | www.913342.com | www.44829.com | www.878264.com | www.703323.com | www.793270.com | www.49580.com | 964945.com | www.9959.in | www.657184.com | www.775509.com | 731943.com | 210439.com | www.961517.com | 234252.com | www.772399.com | www.26622.cc | www.204949.com | 199260.com | 905578.com | 027683.com | www.962481.com | www.k88.in | www.52id.com | www.qf72.com | www.8982.online | www.sd33.com | www.iy05.com | www.17378.com | www.869302.com | www.797222.com | www.ft3.cc | 980088.com | www.yc71.com | www.t63.cn | www.830779.com | www.390.in | www.36839.cc | www.r33.com | 99彩票www.588980.com | www.162231.com | www.369843.com | www.969429.com | www.397630.com | www.345242.com | 302151.com | www.rl68.com | www.615622.com | www.4476.cc | www.517191.com | www.cd5.com | www.228368.com | www.609315.com | 110171.com | www.609457.com | 818a.com | www.026414.com | www.081559.com | www.98242.com | 901140.com | www.1946.date | www.202707.com | www.332315.com | www.74iy.com | www.1234.red | www.0812.hk | www.162459.com | www.088105.com | 233745.com | www.707391.com | 81780.com | 785147.com | www.069827.com | www.9365.tv | www.31oq.com | www.4068.xyz | www.6318.cm | www.279280.com | www.327392.com | www.050951.com | www.663868.com | www.796931.com | www.019987.com | 144155.com | www.e07.pw | www.3208.vip | www.848033.com | www.wc6.cc | www.cp2288.com | 632751.com | www.206217.com | www.595569.com | www.yr36.com | www.uz81.com | www.44824.cc | 56ca.com | 369202.com | www.gc57.com | 大玩家彩票www.927191.com | 8943.biz | www.064779.com | 858519.com | www.251777.com | 60aw.com | www.088181.com | www.898427.com | www.756118.com | www.4728.vip | www.092867.com | www.034979.com | www.683425.com | www.875291.com | www.38072.com | www.165907.com | www.890202.com | www.2825.wang | 3753.biz | www.je92.com | www.2344.com | www.74603.com | www.345658.com | 554260.com | www.xa01.com | www.uo93.com | www.34ey.com | www.030474.com | www.468103.com | www.8466.org | www.285896.com | 458021.com | www.025444.com | www.5878.bid | 092234.com | 355721.com | www.602682.com | www.484148.com | 055978.com | www.75588.com | www.719.in | www.403160.com | www.614255.com | www.617189.com | www.914921.com | www.522376.com | 848514.com | 415899.com | 654715.com | www.34429.com | www.406381.com | www.533766.com | www.331555.com | 037969.com | www.56962.cc | www.096870.com | www.8595.cc | www.08tv.com | www.44rl.com | 66303.cc | www.6033.cc | www.093017.com | www.039186.com | www.957034.com | www.887799.cc | 330963.com | www.42579.com | www.29099.cc | www.mh64.com | www.248532.com | 500万彩票www.500pt.com | www.41876.com | www.646747.com | 通盈彩票www.848266.com | www.959457.com | www.809781.com | 24284.com | 亿彩堂www.87668l.com | www.1990.club | www.220856.com | www.500506.com | www.953344.com | www.736378.com | 778709.com | 477637.com | 214466.com | www.531961.com | www.606932.com | www.554401.com | 284008.com | 965404.com | www.233049.com | www.095891.com | www.027129.com | www.527663.com | www.013313.com | www.ej05.com | www.026259.com | www.150683.com | www.217776.com | www.465456.com | www.rh84.com | 37658.com | www.85qo.com | 097868.com | 329190.com | www.62182.cc | www.88kd.com | www.ji60.com | www.18873.cc | www.975527.com | www.593098.com | www.272102.com | www.650261.com | www.722735.com | www.702125.com | www.029074.com | 彩虹8www.ch8955.com | www.732881.com | www.ld33.com | www.582730.com | 727910.com | www.967309.com | www.4304.cc | www.150218.com | www.730281.com | www.099915.com | www.4381.vip | www.15283.cc | www.403372.com | www.538283.com | 888255.com | www.cw53.com | www.2af.com | www.37162.cc | www.354388.com | www.365359.com | www.625271.com | www.557371.com | www.880937.com | www.445277.com | www.876173.com | 554698.com | www.71388.com | www.106689.com | 625157.com | 909099.cc | www.54rr.com | www.15hc.com | www.30av.com | www.25092.com | www.395260.com | 828383.com | www.54oi.com | www.076627.com | www.381097.com | www.518630.com | 550475.com | www.970888.com | www.936122.com | www.951063.com | 654103.com | www.9909.cn | www.020464.com | www.146248.com | www.308688.cc | 凤凰Vwww.www.fh7557.com | 093735.com | 659847.com | 791203.com | www.315662.com | www.567705.com | 791437.com | www.el11.com | www.am2.com | www.ga82.com | PK彩票www.www.23040.com | www.255058.com | www.947639.com | 954429.com | www.844801.com | 35838.com | 235077.com | 大赢家彩票www.599649.com | www.685868.com | www.3854.vip | www.853755.com | www.78608.com | www.9620.org | www.az66.com | www.376068.com | 617319.com | www.91or.com | www.739335.com | 32df.com | www.937050.com | www.739630.com | 936030.com | www.47fm.com | www.237067.com | www.vd27.com | 213681.com | 797429.com | www.77bk.com | www.884503.com | www.881764.com | www.791987.com | 949307.com | 778828.cc | www.144538.com | www.480655.com | www.316632.com | www.859871.com | www.946631.com | 700066.com | www.26iy.com | 597838.cc | www.803734.com | www.200057.cc | www.986429.com | www.746833.com | www.997831.com | www.187334.com | www.53fj.com | 858729.com | www.949772.com | www.969648.com | www.89wk.com | www.244900.com | www.549659.com | www.22972.cc | 490015.com | www.07071.com | www.371.cm | www.8976.online | www.659.live | www.63880.com | www.732531.com | www.799353.com | www.058942.com | www.289973.com | www.1306.com | www.754330.com | 681816.cc | www.ae73.com | www.1782.xyz | www.046615.com | 882614.com | www.982454.com | 213191.com | www.932319.com | www.x69.com | 彩神帝www.767200.com | www.cai0033.com | www.96bg.com | 500彩票www.377507.com | www.75068.com | www.563867.com | www.380076.com | www.233178.com | www.358055.com | www.635881.com | www.794722.com | www.976117.com | 385448.com | www.273107.com | www.594749.com | www.gn92.com | 500彩票www.374277.com | www.24787.com | www.335726.com | www.121463.com | www.813242.com | www.581508.com | 568779.com | www.914545.com | www.623342.com | wz59.cc | 822814.com | www.143772.com | www.312294.com | www.285929.com | www.526186.com | www.686105.com | www.956338.com | www.735393.com | www.367123.com | www.170712.com | www.96273.com | www.670647.com | www.871968.com | www.s13.link | www.8912.cn | www.1509.me | www.9992.vip | www.68598.cc | www.845651.com | www.yc50.com | www.9dd.cc | www.227744.com | www.60ow.com | www.450004.com | www.995933.com | www.720870.com | www.pq86.com | www.748208.com | 名门彩www.33997b.com | 69ar.com | www.4872.biz | www.188016.com | www.659939.com | www.717633.com | www.265018.com | www.96573.com | www.66229.cc | www.035315.com | www.7510.pw | 福彩网www.5522q.cc | YY彩票www.yy63.com | 中国福利彩票www.6364h.com | www.5036.com |