Journal
SOLAR RRL
Volume 4, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202000216
Keywords
all-inorganic perovskites; coordination; humidity stability; hydrogen bonds; polyethyleneimine
Funding
- National Key R&D Program of China [2018YFB1500101]
- 111 Project [B16016]
- National Natural Science Foundation of China [51702096, U1705256, 51572080, 61904053]
- Fundamental Research Funds for the Central Universities [2019MS026, 2019MS027]
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The all-inorganic CsPbI2Br perovskite with superior thermal durability faces challenges of low-phase stability and high moisture sensitivity. Herein, a nonionic additive of polyethyleneimine (PEI) with multiple amino groups is introduced to form hydrogen bond with I-/Br(-)ions and coordinate with Pb2+/Cs(+)ions simultaneously. The strong interplay between PEI and CsPbI2Br achieves a well-controlled grain size, reduced defects, and reinforced phase structure of CsPbI2Br film, which boosts the power conversion efficiency (PCE) of perovskite solar cells to 15.48%. The hydrophobic long alkyl chain of PEI greatly improves the humidity resistance, retaining 81.9% of initial PCE of zjr unsealed device under 20 +/- 5% relative humidity (RH) for 500 h. Remarkably, a PCE of 13.37% is achieved by the device based on CsPbI2Br-PEI film processed under ambient condition (approximate to 22% RH, approximate to 25 degrees C).
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