2025-08-11 ユニバーシティ・カレッジ・ロンドン（UCL）
＜関連情報＞
- https://www.ucl.ac.uk/news/2025/aug/new-solar-cells-could-power-devices-indoor-light
- https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adfm.202502152
広帯域ギャップペロブスカイトにおける三重パッシベーション再組み立てとn型からp型へのモジュレーションにより、室内太陽光発電効率を37.6%に向上 Enhancing Indoor Photovoltaic Efficiency to 37.6% Through Triple Passivation Reassembly and n-Type to p-Type Modulation in Wide Bandgap Perovskites
Siming Huang, Shanyue Hou, Galyam Sanfo, Jingdong Xu, Yuting Wang, Himal Muwanwella, Lukas Pfeifer, Xiang Liu, Shaik M Zakeeruddin, Yuelong Huang, Michael Grätzel …
Advanced Functional Materials Published: 30 April 2025
DOI:https://doi.org/10.1002/adfm.202502152
Graphical Abstract
Triple Passivation Treatment (TPT) strategy enables 1.75 eV wide-bandgap perovskite solar cells (WB-PSCs) with suppressed halide phase segregation and n-to-p type surface transition. The photoluminescence quantum yield increases from 0.5 to 2.1%, indicating reduced non-radiative losses. The champion device achieves indoor photovoltaic efficiency of 37.6% under 1000 lux and 20.1% under 1 sun, with excellent stability retaining 92% efficiency after 3200 h.
Abstract
Despite well-matching indoor illumination spectra, the performance of wide bandgap perovskite solar cells (WB-PSCs) for indoor photovoltaics (i-PV) is hindered by photo-induced halide phase segregation and trap-assisted non-radiative recombination. Herein, a Triple Passivation Treatment (TPT) reassembly strategy is presented to simultaneously suppress bulk and surface defects. TPT induces a transition in perovskite surface energetics from n-type to p-type and remarkably increases the photoluminescence quantum yield from 0.5 to 2.1%, creating a more favorable band alignment for hole extraction whilst substantially reducing halide phase segregation. As a result, 1.75 eV WB-PSCs achieve an indoor Power Conversion Efficiency (iPCE) of 37.6% under 1000 lux illumination. Under standard sunlight conditions, the devices reach a Power Conversion Efficiency (PCE) of 20.1% and a fill factor of 78.5%, among the best performance parameters for this bandgap. Importantly, the passivated devices exhibit excellent shelf stability, retaining 92% of their initial performance after 3200 h. Under ambient air conditions at 55 °C, the unencapsulated devices maintained 76% of their initial PCE after 300 h continuous light soaking. The findings represent a significant breakthrough in the development of stable WB-PSCs for i-PV applications, with minimized nonradiative losses and enhanced performance.
