Kangming Ou , Jiale Liu , Junwei Xiang, Chaoyang Wang, Jiayu Xie, Xiaoyu Li, Yanjie Cheng, Qiaojiao Gao, Lingya Gao, Anyi Mei, Yang Zhou, Hongwei Han
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引用次数: 0
Abstract
The stacking of multiple defect-rich grain boundaries (GBs) along the long transportation path (∼3 μm) of charge carriers in printable mesoscopic perovskite solar cells (p-MPSCs) impedes their power conversion efficiency (PCE). Organic Lewis bases are widely utilized for defect passivation at GBs, but how their passivation efficiency affects energy loss remains unclear. Here we employed triphenylphosphine (TPP) and triphenylphosphine oxide (TPPO) as the model passivators in p-MPSCs. TPPO has a more negatively charged center than TPP, which enables its stronger coordination with one of the most common and detrimental defects at the GBs—undercoordinated lead. When added into the perovskite with the same ratio, TPPO passivates defects more significantly and thus less TPPO remaining inactive compared with TPP. Inactive organic passivators accumulated at the GBs could impose barriers to charge carrier transportation. Indeed, TPPO improves the device performance more significantly with a champion PCE of 20.54% achieved. Besides, the TPPO devices demonstrate excellent stability with 95% of initial PCE remaining after 600 h of maximum power point tracking at (55 ± 5)°C.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy