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Improving the Extraction of Photogenerated Electrons with SnO 2 Nanocolloids for Efficient Planar Perovskite Solar Cells
Author(s) -
Rao HuaShang,
Chen BaiXue,
Li WenGuang,
Xu YangFan,
Chen HongYan,
Kuang DaiBin,
Su ChengYong
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501264
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , photocurrent , trihalide , tin oxide , perovskite solar cell , optoelectronics , layer (electronics) , electron mobility , doping , crystallization , nanotechnology , chemical engineering , inorganic chemistry , halide , chemistry , engineering
Great attention to cost‐effective high‐efficiency solar power conversion of trihalide perovskite solar cells (PSCs) has been hovering at high levels in the recent 5 years. Among PSC devices, admittedly, TiO 2 is the most widely used electron transport layer (ETL); however, its low mobility which is even less than that of CH 3 NH 3 PbI 3 makes it not an ideal material. In principle, SnO 2 with higher electron mobility can be regarded as a positive alternative. Herein, a SnO 2 nanocolloid sol with ≈3 nm in size synthesized at 60 °C was spin‐coated onto the fuorine‐doped tin oxide (FTO) glass as the ETL of planar CH 3 NH 3 PbI 3 perovskite solar cells. TiCl 4 treatment of SnO 2 ‐coated FTO is found to improve crystallization and increase the surface coverage of perovskites, which plays a pivotal role in improving the power conversion efficiency (PCE). In this report, a champion efficiency of 14.69% ( J sc = 21.19 mA cm −2 , V oc = 1023 mV, and FF = 0.678) is obtained with a metal mask at one sun illumination (AM 1.5G, 100 mW cm −2 ). Compared to the typical TiO 2 , the SnO 2 ETL efficiently facilitates the separation and transportation of photogenerated electrons/holes from the perovskite absorber, which results in a significant enhancement of photocurrent and PCE.