Journal
JOURNAL OF PHYSICS-ENERGY
Volume 4, Issue 4, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2515-7655/ac975a
Keywords
additives; metformin hydrochloride; perovskite solar cells; defect passivation
Funding
- National Natural Science Foundation of China [51673139, 91633301]
- development of key academic projects in Jiangsu universities
- National and Local Joint Engineering Laboratory for New Functional Polymer Materials
- Suzhou Nanotechnology Collaborative Innovation Center
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX22_3186]
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By introducing metformin hydrochloride as an additive, defects at the grain boundaries and surfaces of perovskite thin films can be passivated, leading to enhanced photovoltaic performance and stability.
Defects at the grain boundaries and surfaces of perovskite thin films are the key factors that cause nonradiative recombination, thus restricting the performance of perovskite solar cells (Pero-SCs). By introducing foreign additives to manage the chemical environment of the precursor, perovskite films can obtain optimized morphology and reduced defects, thereby enhancing the photovoltaic performance and stability of derived Pero-SCs. Herein, we report the bifunctional molecule metformin hydrochloride (MetHCl), whose multidentate structure is capable of simultaneously passivating several sorts of defects in perovskite films. Concurrently, the strong binding ability to Pb2+ makes it impressive in regulating perovskite crystallization. The nonvolatile MetHCl can remain in the perovskite film, contributing to acquiring a high-quality film with denser grains and fewer pinholes. Finally, p-i-n Pero-SCs containing the MetHCl additive exhibited enhanced stability and achieved a champion power conversion efficiency of 21.59% with an open-circuit voltage of 1.17 V.
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