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3 results on '"Guanjun, Yang"'

1. Synergistic Redox Modulation for High‐Performance Nickel Oxide‐Based Inverted Perovskite Solar Modules

Author

Yan Liu, Bin Ding, Gao Zhang, Xintong Ma, Yao Wang, Xin Zhang, Lirong Zeng, Mohammad Khaja Nazeeruddin, Guanjun Yang, and Bo Chen

Subjects
interface reaction, nickel oxide, perovskite solar modules, redox modulation, synergistic, Science
Abstract

Abstract Nickel oxide (NiOx)‐based inverted perovskite solar cells stand as promising candidates for advancing perovskite photovoltaics towards commercialization, leveraging their remarkable stability, scalability, and cost‐effectiveness. However, the interfacial redox reaction between high‐valence Ni4+ and perovskite, alongside the facile conversion of iodide in perovskite into I2, significantly deteriorates the performance and reproducibility of NiOx‐based perovskite photovoltaics. Here, potassium borohydride (KBH4) is introduced as a dual‐action reductant, which effectively avoids the Ni4+/perovskite interface reaction and mitigates the iodide‐to‐I2 oxidation within perovskite film. This synergistic redox modulation significantly suppresses nonradiative recombination and increases the carrier lifetime. As a result, an impressive power conversion efficiency of 24.17% for NiOx‐based perovskite solar cells is achieved, and a record efficiency of 20.2% for NiOx‐based perovskite solar modules fabricated under ambient conditions. Notably, when evaluated using the ISOS‐L‐2 standard protocol, the module retains 94% of its initial efficiency after 2000 h of continuous illumination under maximum power point at 65 °C in ambient air.

Published
2024
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3. Multifunctional Phosphorus‐Containing Lewis Acid and Base Passivation Enabling Efficient and Moisture‐Stable Perovskite Solar Cells

Author

Jialin Dang, Yongqiang Ji, Wu-Qiang Wu, Zhi Yang, Guanjun Yang, Jinjuan Dou, Minqiang Wang, Dai-Bin Kuang, and Song Kou

Subjects
Materials science, Passivation, Moisture, Halide, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Biomaterials, Chemical engineering, Phase (matter), Electrochemistry, Degradation (geology), Relative humidity, Lewis acids and bases, 0210 nano-technology, Perovskite (structure)
Abstract

Multiple-cation lead mixed-halide perovskites (MLMPs) have been recognized as ideal candidates in perovskite solar cells in terms of high efficiency and stability due to decreased open-circuit voltage loss and suppressed yellow phase formation. However, they still suffer from an unsatisfactory long-term moisture stability. In this study, phosphorus-containing Lewis acid and base molecules are employed to improve device efficiency and stability based on their multifunction including recombination reduction, phase segregation suppression, and moisture resistance. The strong fluorine-containing Lewis acid treatment can achieve a champion PCE of 22.02%. Unencapsulated and encapsulated devices retain 63% and 80% of the initial efficiency after 14 days of aging under 75% and 85% relative humidity, respectively. The better passivation of Lewis acid implies more halide defects than Pb defects at the MLMP surface. This unbalanced defect type results from phase segregation that is the synergistic effect of Cs and halide ion migrations. Identifying defect type based on different passivation effects is beneficial to not only choose suitable passivators to boost the efficiency and slow down the moisture degradation of MLMP solar cells, but also to understand the mechanism of defect-assisted moisture degradation.

Published
2020

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