期刊
ADVANCED MATERIALS
卷 32, 期 33, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001470
关键词
2D perovskites; mobility; solar cells; spacer cations; trap density
类别
资金
- National Natural Science Foundation of China [21875122, 51673097]
- Fundamental Research Funds for the Central Universities
Quasi-2D Ruddlesden-Popper (RP) perovskite solar cells (PSCs) have drawn significant attention due to their appealing environmental stability compared to their 3D counterparts. However, the relatively low power conversion efficiency (PCE) greatly limits their applications. Here, high photovoltaic performance is demonstrated for quasi-2D RP PSCs using 2-thiophenemethylammonium as spacer with nominaln-value of 5, which is based on the stoichiometry of the precursors. The incorporation of formamidinium (FA) in quasi-2D RP perovskites reduces the bandgap and improves the light absorption ability, resulting in enlarged photocurrent and an increased PCE of 16.18%, which is higher than that of reported analogous methylammonium (MA)-based quasi-2D PSC (approximate to 15%). A record high PCE of 19.06% is further demonstrated by using an organic salt, namely, 4-(trifluoromethyl)benzylammonium iodide, assisted crystal growth (OACG) technique, which can induce the crystal growth and orientation, tune the surface energy levels, and suppress the charge recombination losses. More importantly, the devices based on OACG-processed quasi-2D RP perovskites show remarkable environmental stability and thermal stability, for example, the PCE retaining approximate to 96% of its initial value after storage at 80 degrees C for 576 h, while only approximate to 37% of the original efficiency left for FAPbI(3)-based 3D PSCs.
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