Disulfidation Interfacial Engineering toward Stable, Lead-Immobilizable Perovskite Solar Cells

被引:22
作者
Fu, Guiming [1 ]
Lee, Do-Kyoung [1 ,2 ]
Ma, Chunqing [1 ,3 ]
Park, Nam-Gyu [1 ,4 ]
机构
[1] Sungkyunkwan Univ, Ctr Antibonding Regulated Crystals, Sch Chem Engn, Suwon 16419, South Korea
[2] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94710 USA
[3] Univ Calif Los Angeles, Calif Nano Syst Inst, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
[4] Sungkyunkwan Univ, SKKU Inst Energy Sci & Technol SIEST, Suwon 16419, South Korea
基金
新加坡国家研究基金会;
关键词
ION MIGRATION; EFFICIENT; FILMS;
D O I
10.1021/acsenergylett.3c01823
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Despite the multifaceted advantages, perovskite solar cells (PSCs) still suffer from low-stability issues under oxygen or moisture, which are largely due to the weak bonding and surface defects. The resulting soft nature makes the perovskite interface fragile to attack from ambient oxygen and water. Here, we report a facial surface disulfidation process via a compatible organic dithiolate compound to inhibit defects on the surface and immobilize lead ions. It is confirmed that the dithiolate groups can form strong lead-sulfur (Pb-S) bonds and efficiently reduce nonradiative recombination. Additionally, the passivation process can cause a downshift in the energy bond, resulting in efficient hole extraction at the perovskite interface. As a result, the devices with the dithiolate-passivated perovskite films exhibit better power conversion efficiency than the control devices, mainly due to the enhanced open-circuit voltage. The strong Pb-S bond improves the device stability by over 85% of its initial efficiency after 2000 h. In addition, lead leakage from the device is substantially suppressed by the disulfidation surface passivation.
引用
收藏
页码:4563 / 4571
页数:9
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