期刊
CHEMSUSCHEM
卷 10, 期 11, 页码 2473-2479出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201700271
关键词
hole-transport layer; lead halides; lewis base; perovskite solar cells; poly(4-vinylpyridine)
资金
- Japan Science and Technology Agency (JST) Advanced Low Carbon Technology R&D program (ALCA)
- Japanese Society for Promotion of Science (JSPS) [26289265]
- New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [16K05888, 16H03890] Funding Source: KAKEN
It is well known that the surface trap states and electronic disorders in the solution-processed CH3NH3PbI3 perovskite film affect the solar cell performance significantly and moisture sensitivity of photoactive perovskite material limits its practical applications. Herein, we show the surface modification of a perovskite film with a solution-processable hydrophobic polymer (poly(4-vinylpyridine), PVP), which passivates the undercoordinated lead (Pb) atoms (on the surface of perovskite) by its pyridine Lewis base side chains and thereby eliminates surfacetrap states and non-radiative recombination. Moreover, it acts as an electron barrier between the perovskite and hole-transport layer (HTL) to reduce interfacial charge recombination, which led to improvement in open-circuit voltage (V-oc) by 120 to 160 mV whereas the standard cell fabricated in same conditions showed Voc as low as 0.9 V owing to dominating interfacial recombination processes. Consequently, the power conversion efficiency (PCE) increased by 3 to 5% in the polymer-modified devices (PCE=15%) with V-oc more than 1.05 V and hysteresis-less J-V curves. Advantageously, hydrophobicity of the polymer chain was found to protect the perovskite surface from moisture and improved stability of the non-encapsulated cells, which retained their device performance up to 30 days of exposure to open atmosphere (50% humidity).
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