作者
Fengjiu Yang,Philipp Tockhorn,Artem Musiienko,Felix Lang,Dorothee Menzel,Rowan W. MacQueen,Eike Köhnen,Ke Xu,Silvia Mariotti,Daniele Mantione,Lena Merten,Alexander Hinderhofer,Bor Li,Dan R. Wargulski,Steven P. Harvey,Jiahuan Zhang,Florian Scheler,Sebastian Berwig,Marcel Roß,Jarla Thiesbrummel,Amran Al‐Ashouri,Kai Oliver Brinkmann,Thomas Riedl,Frank Schreiber,Daniel Abou‐Ras,Henry J. Snaith,Dieter Neher,Lars Korte,Martin Stolterfoht,Steve Albrecht
摘要
Abstract All‐perovskite tandem solar cells show great potential to enable the highest performance at reasonable costs for a viable market entry in the near future. In particular, wide‐bandgap (WBG) perovskites with higher open‐circuit voltage ( V OC ) are essential to further improve the tandem solar cells’ performance. Here, a new 1.8 eV bandgap triple‐halide perovskite composition in conjunction with a piperazinium iodide (PI) surface treatment is developed. With structural analysis, it is found that the PI modifies the surface through a reduction of excess lead iodide in the perovskite and additionally penetrates the bulk. Constant light‐induced magneto‐transport measurements are applied to separately resolve charge carrier properties of electrons and holes. These measurements reveal a reduced deep trap state density, and improved steady‐state carrier lifetime (factor 2.6) and diffusion lengths (factor 1.6). As a result, WBG PSCs achieve 1.36 V V OC , reaching 90% of the radiative limit. Combined with a 1.26 eV narrow bandgap (NBG) perovskite with a rubidium iodide additive, this enables a tandem cell with a certified scan efficiency of 27.5%.