基于碱金属氯化物的钙钛矿太阳能电池界面钝化  

Interface Passivation of Perovskite Solar Cells Based on Alkali Metal Chloride

作　　者：李德辉[1] 王宝旭 张景林[1] LI Dehui;WANG Baoxu;ZHANG Jinglin(College of Electrical Science and Engineering,Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学电子科学与工程学院,长春130012

出　　处：《吉林大学学报（信息科学版）》2021年第5期518-524,共7页Journal of Jilin University（Information Science Edition）

基　　金：国家自然科学基金资助项目(62175084,62005093)。

摘　　要：针对钙钛矿太阳能电池的电子传输层/钙钛矿层界面处存在的大量缺陷,提出了一种无机盐界面钝化的优化策略。该策略选用低成本的氯化锂(LiCl:Lithium Chloride)作为电子传输层/钙钛矿层的界面钝化材料,制备了器件结构为ITO/TiO_(2)/LiCl/CH_(3)NH_(3)PbI_(3)/spiro-OMeTAD/Ag的钙钛矿太阳能电池。在引入浓度经过优化的LiCl后,钙钛矿太阳能电池的短路电流密度和填充因子达到21.05 mA/cm^(2)和72.55%,能量转换效率为16.95%,与没有引入LiCl的器件相比提高了23.00%。对器件和薄膜进行表征后发现,LiCl可以钝化界面处的缺陷和陷阱,并提高了TiO_(2)的电导率,从而减少了界面复合损失,促进了电荷传输。Aiming at the large number of defects at the electron transport layer/perovskite layer interface of perovskite solar cells,an optimized strategy employing an inorganic salt for interface passivation is proposed.This strategy selects low-cost LiCl(Lithium Chloride)as the interface passivation material between the electron transport layer and perovskite layer,and prepares the perovskite solar cell with the device structure of ITO/TiO_(2)/LiCl/CH_(3)NH_(3)PbI_(3)/spiro-OMeTAD/Ag.After the introduction of LiCl with an optimized concentration,the short-circuit current density and fill factor of the perovskite solar cell achieve 21.05 mA/cm^(2) and 72.55%,and the energy conversion efficiency is 16.95%,which shows an increase of 23.00%compared with the device without the introduction of LiCl.After characterizing the device and the film,it is found that LiCl can passivate the defects and traps at the interface and increase the conductivity of TiO_(2),thereby reducing the interface recombination loss and promoting the charge transport.

关 键 词：钙钛矿太阳能电池 界面钝化 缺陷 电导率 界面复合 电荷传输 

分 类 号：TM914.4[电气工程—电力电子与电力传动]