(NH_(4))_(2)S修饰SnO_(2)/钙钛矿界面对钙钛矿太阳能电池性能的影响  

Effects of(NH_(4))_(2)S modified SnO_(2)/perovskite interface on the performance of perovskite solar cells

作　　者：韩亮 崔灿[1] HAN Liang;CUI Can(School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学理学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2023年第6期725-733,共9页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(11804300)。

摘　　要：为了降低电子传输层(Electron transport layer,ETL)与钙钛矿层之间的界面缺陷态密度,通过旋涂法在氧化铟锡(Indium tin oxide,ITO)透明导电玻璃上制备一层SnO_(2)电子传输层,并在其上表面旋涂(NH_(4))_(2)S以修饰SnO_(2)和钙钛矿光吸收层之间的界面。通过X射线光电子能谱、扫描电子显微镜、电化学阻抗谱等表征手段分析(NH_(4))_(2)S修饰对钙钛矿太阳能电池(Perovskite solar cells,PSCs)光电性能的影响。结果表明:NH_(4)^(+)降低了SnO_(2)的表面羟基(—OH)缺陷态密度,增强了界面的疏水性,减少了钙钛矿的形核位点,增大了钙钛矿晶粒;S^(2-)填补了SnO_(2)表面的氧空位(OV),同时部分S^(2-)还与未配位Pb^(2+)连接减少界面处Pb缺陷,抑制了界面处载流子复合;经过(NH_(4))_(2)S的修饰,PSCs开路电压从1.07 V提高到1.11 V,光电转化效率达到了20.53%。(NH_(4))2S修饰后的PSCs具有更高的光电转化效率、更好的长期稳定性。该研究可为PSCs商业化提供新的思路。To reduce the interface defect state density between the electron transport layer(ETL)and the perovskite layer,a SnO_(2)electron transport layer was prepared on the indium-tin oxide(ITO)transparent conductive glass by spin-coating method,and(NH_(4))_(2)S was spin-coated on the top surface to modify the interface between SnO_(2)and perovskite light absorption layer.The effect of(NH_(4))_(2)S on the photoelectric performance of perovskite solar cells(PSCs)was analyzed by X-ray photoelectron spectroscopy,scanning electron microscopy and electrochemical impedance spectroscopy.The results show that NH_(4)^(+)reduces the density of surface hydroxyl(—OH)defect states of SnO_(2),thereby enhancing the hydrophobicity of the interface,reducing the nucleation sites of perovskite,and increasing the perovskite grains.At the same time,S^(2-)can fill the oxygen vacancies(OV)on the surface of SnO_(2)and part of S^(2-)is also connected with uncoordinated Pb^(2+)to reduce Pb defects at the interface and inhibit carrier recombination at the interface.Therefore,after the modification of(NH_(4))2S,the open circuit voltage of the PSCs increases from 1.07 V to 1.11 V,and the photoelectric conversion efficiency reaches 20.53%.The(NH_(4))2S-modified PSCs have higher photoelectric conversion efficiency and better long-term stability.This study is expected to provide new ideas for the commercialization of PSCs.

关 键 词：(NH_(4))_(2)S 界面修饰 钙钛矿太阳能电池 钙钛矿晶粒 开路电压 光电转化效率 

分 类 号：TM914.4[电气工程—电力电子与电力传动]