钝化
钙钛矿(结构)
离子
碘化物
材料科学
热稳定性
能量转换效率
化学工程
化学
光电子学
无机化学
纳米技术
结晶学
有机化学
图层(电子)
工程类
作者
Hualin Zheng,Xuefeng Peng,Tingxi Chen,Ting Zhang,Shihao Yuan,Lei Wang,Feng Qian,Jiang Huang,Xiaodong Liu,Zhi Chen,Yanning Zhang,Shibin Li
标识
DOI:10.1016/j.jechem.2023.05.046
摘要
Two-dimensional (2D) alternating cation (ACI) perovskite surface defects, especially dominant iodine vacancies (VI) and undercoordinated Pb2+, limit the performance of perovskite solar cells (PVSCs). To address the issue, 1-butyl-3-methylimidazolium trifluoro-methane-sulfonate (BMIMOTF) and its iodide counterpart (BMIMI) are utilized to modify the perovskite surface respectively. We find that BMIMI can change the perovskite surface, whereas BMIMOTF shows a nondestructive and more effective defect passivation, giving significantly reduced defect density and suppressed charge-carrier nonradiative recombination. This mainly attributes to the marked passivation efficacy of OTF− anion on VI and undercoordinated Pb2+, rather than BMIMI+ cation. Benefiting from the rational surface-modification of BMMIMOTF, the films exhibit an optimized energy level alignment, enhanced hydrophobicity and suppressed ion migration. Consequently, the BMIMOTF-modified devices achieve an impressive efficiency of 21.38% with a record open-circuit voltage of 1.195 V, which is among the best efficiencies reported for 2D PVSCs, and display greatly enhanced humidity and thermal stability.
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