Universal Current Losses in Perovskite Solar Cells Due to Mobile Ions

被引:85
|
作者
Thiesbrummel, Jarla [1 ]
Le Corre, Vincent M. [2 ]
Pena-Camargo, Francisco [2 ]
Perdigon-Toro, Lorena [2 ]
Lang, Felix [2 ]
Yang, Fengjiu [3 ]
Grischek, Max [2 ,3 ]
Gutierrez-Partida, Emilio [2 ]
Warby, Jonathan [2 ]
Farrar, Michael D. [1 ]
Mahesh, Suhas [1 ]
Caprioglio, Pietro [1 ]
Albrecht, Steve [3 ]
Neher, Dieter [2 ]
Snaith, Henry J. [1 ]
Stolterfoht, Martin [2 ]
机构
[1] Univ Oxford, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England
[2] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany
[3] Helmholtz Zentrum Berlin, Young Investigator Grp Perovskite Tandem Solar Ce, Kekulestr 5, D-12489 Berlin, Germany
基金
英国工程与自然科学研究理事会;
关键词
current losses; mobile ions; non-radiative recombination; perovskite solar cells; Sn perovskite; transient photoluminescence; SHOCKLEY-QUEISSER LIMIT; ANOMALOUS HYSTERESIS; HALIDE PEROVSKITES; TIN; STABILITY; EFFICIENT; DEGRADATION; ABSORPTION; TRANSIENTS; OXIDATION;
D O I
10.1002/aenm.202101447
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
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 (approximate to 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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页数:10
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