In:
Small, Wiley, Vol. 13, No. 2 ( 2017-01)
Abstract:
Despite the rapid increase of efficiency, perovskite solar cells (PSCs) still face some challenges, one of which is the current–voltage hysteresis. Herein, it is reported that yttrium‐doped tin dioxide (Y‐SnO 2 ) electron selective layer (ESL) synthesized by an in situ hydrothermal growth process at 95 °C can significantly reduce the hysteresis and improve the performance of PSCs. Comparison studies reveal two main effects of Y doping of SnO 2 ESLs: (1) it promotes the formation of well‐aligned and more homogeneous distribution of SnO 2 nanosheet arrays (NSAs), which allows better perovskite infiltration, better contacts of perovskite with SnO 2 nanosheets, and improves electron transfer from perovskite to ESL; (2) it enlarges the band gap and upshifts the band energy levels, resulting in better energy level alignment with perovskite and reduced charge recombination at NSA/perovskite interfaces. As a result, PSCs using Y‐SnO 2 NSA ESLs exhibit much less hysteresis and better performance compared with the cells using pristine SnO 2 NSA ESLs. The champion cell using Y‐SnO 2 NSA ESL achieves a photovoltaic conversion efficiency of 17.29% (16.97%) when measured under reverse (forward) voltage scanning and a steady‐state efficiency of 16.25%. The results suggest that low‐temperature hydrothermal‐synthesized Y‐SnO 2 NSA is a promising ESL for fabricating efficient and hysteresis‐less PSC.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.201601769
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
2168935-0