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Porphyrinic Metal–Organic Framework Quantum Dots for Stable n–i–p Perovskite Solar Cells

Yinjiang LiuState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaTao LiuState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaXi GuoState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaMeichen HouState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaYihui YuanState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaSe ShiState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaHui WangState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 ChinaRuizhi ZhangSchool of Engineering and Materials Science Queen Mary University of London London E1 4NS UKCostas GaliotisDepartment of Chemical Engineering University of Patras 26504 Patras GreeceNing WangState Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 China

2022en

ABI

Annotatsiya

Abstract As the power‐conversion efficiency (PCE) of organic–inorganic lead halide perovskite solar cells (PSCs) is approaching the theoretical maximum, the most crucial issue concerns long‐term ambient stability. Here, the application of PCN‐224 quantum dots (QDs) is reported, a typical Zr‐based porphyrinic metal–organic framework (MOF), to enhance the ambient stability of PSCs. PCN‐224 QDs with abundant Lewis‐base groups (e.g., CO, C−N, CN) contribute to high‐quality perovskite films with enlarged grain size and reduced defect density by interaction with under‐coordinated Pb 2+ . Meanwhile, PCN‐224 QDs enable the well‐matched energy level at the perovskite/hole transport layer (HTL) interface, thereby facilitating hole extraction and transport. More importantly, PCN‐224 QDs‐treated HTL can capture Li + from bis(trifluoromethanesulfonyl)imide additive, leading to the reduced aggregation and less direct contact with moisture for hygroscopic Li‐TFSI. Moreover, PCN‐224 QDs mitigated Li + ion migration into the perovskite layer, thus avoiding the formation of deleterious defects. The resultant devices yield a champion PCE of 22.51%, along with substantially improved durability, including humidity, thermal and light soaking stabilities. The findings provide a new approach toward efficient and stable PSCs by applying MOF QDs.

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Identifikatorlar

DOI: 10.1002/adfm.202210028

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