Rubidium Iodide Reduces Recombination Losses in Methylammonium-Free Tin-Lead Perovskite Solar Cells

被引:18
|
作者
Yang, Fengjiu [1 ]
MacQueen, Rowan W. [1 ]
Menzel, Dorothee [1 ]
Musiienko, Artem [1 ]
Al-Ashouri, Amran [1 ]
Thiesbrummel, Jarla [2 ]
Shah, Sahil [3 ]
Prashanthan, Karunanantharajah [1 ,4 ]
Abou-Ras, Daniel [1 ]
Korte, Lars [1 ]
Stolterfoht, Martin [3 ]
Neher, Dieter [3 ]
Levine, Igal [1 ]
Snaith, Henry [2 ]
Albrecht, Steve [1 ,5 ]
机构
[1] Helmholtz Zentrum Berlin Mat & Energie GmbH, Div Solar Energy, D-12489 Berlin, Germany
[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England
[3] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam Golm, Germany
[4] Univ Jaffna, Dept Phys, Jaffna 40000, JA, Sri Lanka
[5] Tech Univ Berlin, Fac Elect Engn & Comp Sci, D-10587 Berlin, Germany
基金
英国工程与自然科学研究理事会;
关键词
constant final state yield photoelectron spectroscopy; methylammonium-free tin-lead perovskites; quasi-Fermi level splitting; rubidium iodide additive; transient photoluminescence; LIGHT SOAKING; EFFICIENCY; SN;
D O I
10.1002/aenm.202204339
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
Outstanding optoelectronic properties of mixed tin-lead perovskites are the cornerstone for the development of high-efficiency all-perovskite tandems. However, recombination losses in Sn-Pb perovskites still limit the performance of these perovskites, necessitating more fundamental research. Here, rubidium iodide is employed as an additive for methylammonium-free Sn-Pb perovskites. It is first investigated the effect of the RbI additive on the perovskite composition, crystal structure, and element distribution. Quasi-Fermi level splitting and transient photoluminescence measurements reveal that the RbI additive reduces recombination losses and increases carrier lifetime of the perovskite films. This finding is attributed to an approximately ten-fold reduction in the defect density following RbI treatment, as probed using constant final state yield photoelectron spectroscopy. Additionally, the concentration of Sn vacancies is also reduced, and the perovskite film becomes less p-type both in the bulk and at the interface towards the electron contact. Thus, the conductivity for electrons increases, improving carrier extraction. As a result, the open-circuit voltage of RbI-containing solar cells improves by 61 mV on average, with the best efficiency >20%. This comprehensive study demonstrates that RbI is effective at reducing recombination losses and carrier trapping, paving way for a new approach to Sn-Pb perovskite solar cell research.
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页数:12
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