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

百姓彩票www.bxcp3.com www.15281.cc | www.114260.com | www.po73.com | www.2010.in | www.192672.com | www.305671.com | www.647364.com | 802859.com | 45133.com | 607713.com | www.3908.in | www.022834.com | www.121534.com | www.332999.com | www.735262.com | www.879704.com | 213693.com | www.w87.club | www.554383.com | www.366839.com | www.917015.com | 007029.com | www.xh41.com | www.3370.vip | www.37653.cc | www.037520.com | www.266625.com | www.796046.com | www.974553.com | www.mn45.com | www.099313.com | 607326.com | 864492.com | 259744.com | www.md36.com | www.57612.cc | www.772830.com | www.851850.com | www.858433.com | www.1425.xyz | www.97644.com | www.135279.com | www.125013.com | www.90007.com | www.628910.com | 339492.com | 442336.com | 0035.online | www.998250.com | www.472886.com | www.022406.com | www.153034.com | www.549827.com | www.861096.com | www.900990.cc | 4867.biz | www.988568.com | www.037978.com | 923767.com | JJ彩票www.31930.cc | www.wc08.com | www.400733.com | 01700.com | 489111.com | l49.top | www.mj13.com | www.35223.cc | www.026270.com | www.191498.com | www.312220.com | www.627981.com | www.818696.com | www.922926.com | www.963325.com | www.2983.vip | www.21123.com | www.359289.com | www.864080.com | www.89303.cc | 835989.com | www.nr6.com | www.tg94.com | www.q62.in | www.9961.online | www.71954.com | www.111735.com | www.266834.com | www.356209.com | www.026530.com | www.829297.com | www.767979.com | www.677961.com | www.576561.com | www.555241.com | www.628810.com | 3664.biz | www.995384.com | 977473.com | www.594855.com | 984065.com | 088075.com | www.2334.cm | 419551.com | www.687.in | www.211653.com | www.326292.com | www.cm24.com | www.0807.vip | www.021618.com | www.116085.com | 80hu.com | 539934.com | 761465.com | www.128734.com | www.311134.com | www.742539.cc | www.883201.com | 24503.cc | 500彩票网www.65707m.com | www.xu22.com | www.8580.loan | www.09980.com | www.8193.wang | www.47859.cc | www.369322.com | 520857.com | www.ey67.com | www.51205.com | www.329115.com | www.755346.com | 604495.com | www.4066am.com | 234750.com | www.352301.com | www.536963.com | www.588293.com | 921928.com | www.xy58.com | www.03387.com | www.850303.com | 739213.com | www.238043.com | www.42.me | www.024477.com | www.162998.com | www.447987.com | www.67sc.com | 376872.com | www.4150.win | www.794807.com | www.933806.com | 665524.com | 560890.com | 977243.com | www.ax23.com | www.59571.cc | www.565480.com | www.614607.com | 35354.com | www.965444.com | www.990928.com | 795646.com | 397334.com | 191088.com | www.321302.com | q60.org | www.54.net | www.8092.cn | www.124779.com | www.199351.com | www.327350.com | www.365263.cc | www.782135.com | 93au.cc | 943501.com | www.cp9598.com | www.6325.com | www.58074.com | 540110.com | 271984.com | www.cp3619.com | www.il05.com | www.1738.biz | www.52421.cc | www.118233.com | www.123631.com | www.137033.com | 8187.org | 803538.com | 彩宝www.cb5588.com | www.46xu.com | www.2221.com | www.55267.cc | www.414256.com | www.529171.com | www.676448.com | www.009726.com | www.692257.com | www.895005.com | 077153.com | 337865.com | www.14xy.com | www.2098.vip | www.071988.com | www.570318.com | www.732568.com | www.936956.com | 933323.com | 591419.com | www.88yy.com | www.5990.pw | www.55325.cc | www.098033.com | www.189330.com | www.331016.com | www.480775.com | www.681260.com | www.791331.com | www.877585.com | www.957429.com | www.994490.com | 36789.com | 539027.com | 09695.com | an12.com | www.697287.com | 005403.com | www.065511.com | 704610.com | 933989.com | 309269.com | 彩多多www.78949h.com | www.910302.com | 606906.com | www.5804.cm | www.30150.cc | www.967341.com | www.3573.cn | www.6870.vip | www.9250.vip | www.32319.com | www.h43.net | www.7558.in | www.974.org | www.22672.cc | www.39817.cc | www.26632.cc | www.43ew.com | www.52161.cc | www.569004.com | www.57cg.com | www.0444.cn | www.99912.com | www.031158.com | www.908561.com | 512572.com | 670632.com | www.bt96.com | www.76122.cc | www.111348.com | www.20089.com | www.79958.cc | www.272788.cc | 210966.com | www.485345.com | www.692168.com | www.137659.com | www.777076.com | www.wm70.com | www.0se.com | www.61ck.com | www.727952.com | www.38827.com | www.059565.com | www.428684.com | www.595106.com | www.499988.com | www.949640.com | www.188046.com | 凤彩网www.11gpc.com | www.433117.com | www.740010.com | www.707027.com | www.882392.com | www.722615.com | www.706536.com | www.283153.com | www.336224.com | www.175361.com | www.312592.com | www.954766.com | 天天彩票www.106056.com | k3k3彩票www.602985.com | 幸运彩票www.768299.com | 天天彩票www.106326.com | www.7131.cm | www.32651.com | www.71417.com | www.509870.com | www.oh61.com | www.5478.com | www.1505.cn | www.153209.com | www.456260.com | www.419780.com | www.550334.com | 083189.cc | 211165.com | 216609.com | 561203.com | cp0404.com | 150256.com | 182298.com | www.986596.com | www.256983.com | www.480078.com | www.53578.com | www.129441.com | www.96474.com | www.98319.cc | www.51772.cc | www.105595.com | www.119163.com | www.163690.com | www.953849.com | www.888232.com | 980459.com | www.455667.com | www.722800.com | 027319.com | 728844.com | 980954.com | 盈利彩票www.359629.com | www.eb67.com | www.79wz.com | www.3903.cc | www.11424.com | www.44668.cc | www.158092.com | www.314146.com | www.751874.com | www.962593.com | www.896557.com | www.792277.com | www.779372.com | www.823.red | www.339467.com | www.550614.com | www.563826.com | www.717783.com | www.604987.com | www.630918.com | www.83398.cc | www.100069.com | www.706641.com | www.7484.cc | www.206997.com | www.724433.com | www.716028.com | 871433.com | www.106749.com | 福彩www.2109r.com | 9209.cc | 4383.biz | www.113149.com | www.2121.club | www.14849.cc | www.00925.com | www.9813.net | www.22735.cc | www.11730.com | www.126462.com | 997514.com | 791480.com | 9456.pw | www.vu06.com | www.ta42.com | www.mg69.com | www.gp34.com | www.d22.cc | www.040788.com | www.094813.com | www.126190.com | www.114996.com | www.592181.com | www.718519.com | www.43yq.com | www.2016.cc | www.8929.com | www.09637.com | www.206859.com | 吉彩www.602327.com | www.1699.win | www.666.wang | www.687776.com | www.717087.com | www.818796.com | 012398.com | 477012.com | 764422.com | 581787.com | www.16840.cc | www.313530.com | www.645746.com | www.970171.com | 853724.com | 085707.com | 867786.cc | 541564.com | 亿龍彩票www.1368b.cc | 553338.com | 74444.com | 129061.com | www.905654.com | www.826290.com | www.286519.com | www.337453.com | www.329806.com | www.99mp.com | www.9363.xyz | www.788748.com | www.935641.com | www.865157.com | 488195.com | www.37905.com | www.454701.com | www.810978.com | www.cai638.com | 578004.com | 108035.com | 849500.com | 107587.com | 973440.com | 619769.com | 59938.com | 117922.com | www.905253.com | www.817381.com | www.fx54.com | www.723722.com | www.617782.com | 风之彩www.44fzc.com | 500彩票www.202423.com | www.22589.cc | www.76016.com | www.425512.com | www.678102.com | www.673579.com | www.601614.com | lq08.com | www.742888.com | www.904996.com | www.rw28.com | www.at40.com | 800483.com | 人人彩票www.rrle9.com | 九九集团www.99jti.com | www.330466.com | www.376646.com | 752706.com | 946872.com | JJ彩票www.39459.cc | 356228.com | 01899.com | www.813314.com | www.927269.com | www.661115.com | www.888068.com | www.636228.com | www.329231.com | 024741.com | 78848.com | www.727681.com | www.698928.com | www.916001.com | 595827.com | www.62282.cc | 博友彩www.939562.com | 195764.com | 119830.com | GO彩www.gen00.com | 512548.com | www.833117.com | www.891993.com | www.703156.com | www.668579.com | www.990244.com | www.974753.com | www.923069.com | www.868438.com | www.17738.com | www.67299.cc | www.6248.cm | www.2776.vip | www.005654.com | www.92713.com | www.06321.cc | www.628411.com | 760737.com | 119678.com | 675093.com | www.436338.com | www.359342.com | www.594633.com | 910042.com | www.td46.com | 894982.com | js50.com | www.69342.com | www.088617.com | www.326110.com | www.124770.com | www.37955.cc | www.88fx.cc | www.cp6661.cc | www.356.tv | www.57981.com | www.030282.com | www.914860.com | www.788037.com | 435879.com | 97558.com | www.62622.com | www.293879.com | www.081601.com | www.003880.com | www.9609.loan | www.63362.com | www.052000.com | www.441342.com | www.338403.com | www.388877.cc | www.669191.com | www.in90.com | www.00653.com | www.5vy.com | www.db26.com | www.92339.com | 993464.com | www.84ba.com | www.66il.com | www.ix25.com | 500彩票www.50080h.com | 985134.com | ztwap.com | 241515.com | www.979938.com | www.726122.com | www.652568.com | www.441219.com | www.448667.com | www.671077.com | www.653957.com | www.875069.com | www.ps92.com | www.65bn.com | 365948.cc | 139427.com | www.195.la | www.1312.me | www.7245.cc | www.03680.com | www.0849.vip | www.007787.com | www.024341.com | www.297527.com | 894869.com | 680891.com | www.958407.com | www.710777.com | www.g72.club | www.wr68.com | www.fp8.com | 天天赢彩票www.73736e.com | www.ef95.com | www.51344.com | www.286621.com | www.083711.com | www.943161.com | www.ya20.com | 彩世界www.99788r.com | www.81707.com | 277253.com | 947137.com | 00887.cc | 347377.com | www.e63.club | www.zm11.com | www.pg9.com | www.35761.cc | www.6301.pw | www.8973.biz | www.8192.cn | www.890957.com | www.726517.com | www.595563.com | www.04do.com | www.qt66.com | www.i18.net | www.7sk.com | www.0761.wang | www.04677.com | www.71770.com | www.015753.com | 8号彩票www.81520n.com | www.cp7198.com | 977942.com | www.4lh.com | www.032393.com | www.951323.com | www.416916.com | www.292234.com | www.127085.com | www.8437.cc | 031053.com | www.974925.com | www.799414.com | www.731294.com | www.366255.cc | 913902.com | www.129390.com | www.567648.com | www.391766.com | www.771591.com | www.698209.com | www.584580.com | 988594.com | www.58193.cc | www.134998.com | www.743688.com | 964096.com | www.0mj.com | 大赢家彩票平台www.217030.com | www.624.mobi | www.8849.vip | www.08yn.com | www.hb9.cc | 500彩票www.346977.com | www.770723.com | 974934.com | www.58413.com | www.39799.cc | www.99jc.cc | 乐博彩票www.021037.com | 734425.com | www.250772.com | www.1960.mobi | www.83993.com | www.84jm.com | www.cp077.com | 654930.com | 756046.com | www.938150.com | www.987037.com | www.737923.com | www.334987.com | 567457.com | www.fw.com | www.039879.com | www.095759.com | www.004961.com | www.04677.com | www.404004.com | www.0179.xyz | www.1034.xyz | www.44056.com | www.020625.com | www.31966.com | www.159091.com | www.291292.com | www.398276.com | www.767902.com | www.664683.com | www.930796.com | www.640039.com | 6073.biz | www.796426.com | www.458013.com | 亚投彩票www.ya308.com | www.950198.com | www.678473.com | www.415066.com | www.237636.com | www.65779.cc | www.53733.com | www.4029.biz | www.605000.com | www.cp0528.com | 104369.com | www.797768.com | www.3983.com | www.8318.net | www.5607.com | www.859971.com | 375041.com | www.798628.com | www.917938.com | 559530.com | www.886066.com | www.875579.com | www.521605.com | 008924.com | 673709.com | 91805.com | 236692.com | 514985.com | www.123615.com | www.180899.com | www.985047.com | www.737688.com | www.460613.com | www.280039.com | www.603871.com | www.801329.com | www.430322.com | www.531038.com | www.px72.com | www.hg93.cc | www.25bt.com | www.at80.com | www.mi74.com | www.dl57.com | 669054.com | 547234.com | 500彩票www.50080b.com | 699869.com | 130958.com | www.984479.com | www.845672.com | www.929099.com | www.706322.com | 811815.cc | 945441.com | www.417545.com | www.316059.com | www.208552.com | 365092.com | www.793.red | www.050867.com | www.385598.com | www.10eg.com | www.63an.com | www.eq5.com | www.qe62.com | www.97344.com | www.2261.vip | www.3811.cc | www.80gv.com | www.uu76.com | 841177.com | www.979285.com | 772510.com | www.137437.com | www.181114.com | www.075602.com | www.u33.club | www.cp8718.com | www.173810.com | www.454524.com | www.788936.com | 华彩www.71399s.com | www.023554.com | 818合彩www.www.8000hc.com | www.45708.com | www.174511.com | www.468707.com | cp1861.cc | www.780015.com | www.91jg.com | www.tn28.com | 654541.com | 587931.com | www.83xo.com | www.391589.com | www.cp0365.com | www.054595.com | 5231.biz | www.845360.com | 87eg.com | www.949163.com | www.730778.com | www.068307.com | www.542421.com | www.654473.com | www.740938.com | www.66781.cc | www.16831.cc | www.129935.com | www.135293.com | www.222281.com | 48123.cc | www.6668.cc | www.mf94.com | cai8282.com | www.995654.com | www.857721.com | 604711.com | 320138.com | www.978548.com | 952414.com | 359599.com | 689809.com | www.006914.com | www.666433.com | www.445117.com | www.130179.com | www.099526.com | www.238318.com | www.913219.com | www.830972.com | www.8597.cc | www.90ew.com | www.by21.com | 619234.com | 358723.com | 960430.com | www.89659.cc | www.008678.com | www.17328.com | 514175.com | 245625.com | www.809111.cc | 268244.com | 易彩网www.99638m.com | 941341.com | www.978143.com | www.r75.org | 029945.com | www.811893.com | www.413171.com | 258802.com | www.995314.com | www.817308.com | www.251982.com | www.125728.com | www.200805.com | www.097778.com | www.133391.com | www.084377.com | www.61108.com | www.570221.com | www.216748.com | www.352774.com | www.sy39.cc | www.3073.vip | www.73340.com | www.755573.com | www.486520.com | www.142122.com | www.385603.com | www.609599.com | www.731496.com | www.826753.com | www.478115.com | www.952065.com | www.626885.com | www.280003.com | www.268067.com | www.017821.com | www.012015.com | www.99955.com | www.2628.me | www.52085.com | www.71934.com | www.5011.xyz | www.ia77.com | 847598.com | 400646.com | www.706269.com | www.392038.com | www.565846.com | 070994.com | www.2908.org | www.g51.com | 649200.com | www.951845.com | www.608226.com | www.788256.com | 彩吧www.586960.com | 976004.com | www.458276.com | www.557556.com | www.048360.com | www.150509.com | www.877377.cc | www.908296.com | www.733639.com | www.500969.com | www.322511.com | www.7