Universal Current Losses in Perovskite Solar Cells Due to Mobile Ions

钙钛矿(结构) 材料科学 串联 兴奋剂 离子 压扁 带隙 卤化物 光电子学 载流子 电荷(物理) 化学物理 无机化学 化学 物理 结晶学 冶金 复合材料 量子力学
作者
Jarla Thiesbrummel,Vincent M. Le Corre,Francisco Peña‐Camargo,Lorena Perdigón‐Toro,Felix Lang,Fengjiu Yang,Max Grischek,Emilio Gutierrez‐Partida,Jonathan Warby,Michael D. Farrar,Suhas Mahesh,Pietro Caprioglio,Steve Albrecht,Dieter Neher,Henry J. Snaith,Martin Stolterfoht
出处
期刊:Advanced Energy Materials [Wiley]
卷期号:11 (34) 被引量:65
标识
DOI:10.1002/aenm.202101447
摘要

Abstract Efficient mixed metal lead‐tin halide perovskites are essential for the development of all‐perovskite tandem solar cells, however they are currently limited by significant short‐circuit current losses despite their near optimal bandgap (≈1.25 eV). Herein, the origin of these losses is investigated, using a combination of voltage dependent photoluminescence (PL) timeseries and various charge extraction measurements. It is demonstrated that the Pb/Sn‐perovskite devices suffer from a reduction in the charge extraction efficiency within the first few seconds of operation, which leads to a loss in current and lower maximum power output. In addition, the emitted PL from the device rises on the exact same timescales due to the accumulation of electronic charges in the active layer. Using transient charge extraction measurements, it is shown that these observations cannot be explained by doping‐induced electronic charges but by the movement of mobile ions toward the perovskite/transport layer interfaces, which inhibits charge extraction due to band flattening. Finally, these findings are generalized to lead‐based perovskites, showing that the loss mechanism is universal. This elucidates the negative role mobile ions play in perovskite solar cells and paves a path toward understanding and mitigating a key loss mechanism.
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