AEM：通過氯化鋰溶后處理制備淺受體型缺陷Cu2ZnSn(S,Se)4太陽能電池

youyoucao 3年前 (2021-02-23) 1756瀏覽

第一作者：Mingrui He, Xian Zhang, Jialiang Huang

通訊作者：Xiaojing Hao,?Jinhyeok Kim, Shiyou Chen, Jianjun Li

合作單位：新南威爾士大學，韓國全南國立大學，華東師范大學，悉尼大學，韓國光州科學技術院

背景介紹

銅鋅錫硫硒（CZTSSe）材料由于其低廉的價格，近年來成為薄膜太陽電池研究的熱點。然而，在合成CZTSSe過程中伴隨著大量晶體缺陷的產生，進而降低了電池的光電轉化效率。因此，如何有效調控缺陷是該領域的重要問題。

文章簡介

近日，新南威爾士大學Xiaojing Hao團隊，韓國全南國立大學Jinhyeok Kim團隊和華東師范大學Shiyou Chen團隊通過使用氯化鋰溶后處理CZTSSe吸收層，實現了更淺的受體型缺陷（LiZn），提高了P型摻雜，將CZTSSe太陽能電池效率提高至10.7%。本文通過納米尺度的化學分析（atom?probe tomography）,電學表征分析（admittance spectra）和密度泛函理論（DFT）闡明了Li在CZTSSe摻雜機制。研究表明，通過該方法可實現Li在CZTSSe晶界和晶體內部的均勻摻雜，并實現10%以上的摻雜效率。0.006% 的Li元素摻雜量就能引入1017?cm-3的LiZn淺受主缺陷，從而顯著改變CZTSSe材料的P-型導電機制和太陽電池器件性能。該成果以題為“High Efficiency Cu2ZnSn(S,Se)4 Solar Cells with Shallow LiZn Acceptor Defects Enabled by Solution-Based Li Post-Deposition Treatment”發表在了Adv.?Eng. Mater.上。

圖文導讀

圖一 Li后處理方法

a)-d)LiCl溶液工藝示意圖及Li后處理方法

e)未處理的CZTSSe吸收層

f)Li摻雜的CZTSSe吸收層

圖二 Li在電池器件的分布

a) CZTSSe和b)鋰摻雜的CZTSSe太陽能電池的元素分布

Li在CZTSSe太陽能電池中的3D分布圖

圖三 電池器件光伏性能

a)電池器件的J-V曲線

b)電池器件的EQE曲線

c)電池器件的帶隙

d)電池器件的Drive level capacity profiling

e)電池器件的Suns-Voc

f)電池器件的Time-resolved photoluminescence

圖四 缺陷表征

a)-b)電池器件的Admittance spectra

c)電池器件的Arrhenius plots

d)電池器件的缺陷態密度

圖五 理論計算

a)不同Li相關缺陷的形成能

b)不同Li相關缺陷在帶隙的位置

c)LiZn?缺陷在晶格的位置

文獻鏈接：High Efficiency Cu2ZnSn(S,Se)4?Solar Cells with Shallow LiZn?Acceptor Defects Enabled by Solution‐Based Li Post‐Deposition Treatment.?Adv. Energy Mater.?2021, 2003783.?https://doi.org/10.1002/aenm.202003783

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