Homogenized Optoelectronic Properties in Perovskites: Achieving High-Efficiency Solar Cells with Common Chloride Additives

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Abstract
Improving the bulk quality of perovskite films is critical for achieving higher-performance photovoltaic devices. Chloride-containing additives, including lead chloride (PbCl2) and methylammonium chloride (MACl)─standard additives widely adopted in perovskite photovoltaics─are effective for controlling crystallization kinetics and grain morphology. However, the distinct impacts of different forms of chloride additives on nanoscale phase uniformity and luminescence homogeneity remain underexplored. Here, we provide new insights into how the choice and combination of chloride additives influence phase transitions and spatially uniform carrier dynamics within perovskite films. We demonstrate that strategically combining MACl and PbCl2 improves crystallinity and optoelectronic uniformity across dimensions spanning micrometers to millimeters. Leveraging these findings, we fabricated inverted (p-i-n) perovskite solar cells achieving certified quasi-steady-state efficiencies of 26.4% and 24.5% at device areas of 0.05 and 1 cm2, respectively. Furthermore, these devices exhibit robust operational stability, retaining 88% of their initial performance after 1200 h of continuous maximum power point tracking at elevated temperatures (65 °C) under simulated AM1.5G illumination. Our results elucidate the mechanistic differences between chloride additive forms, providing a viable strategy for advancing large-area, high-efficiency, and thermally stable perovskite photovoltaics.
Funding Information
  • Shanghai Jiao Tong University
  • JST-Mirai Program (JPMJMI22E2)
  • New Energy and Industrial Technology Development Organization (JPNP20015)
  • New Energy and Industrial Technology Development Organization (JPNP21016)
  • Shanghai Municipal Human Resources and Social Security Bureau (24PJA041)
  • Japan Society for the Promotion of Science (JP24H00481)
  • Japan Society for the Promotion of Science (JP24K01571)
  • Science and Technology Commission of Shanghai Municipality (24PJA041)
  • Institute for Chemical Research, Kyoto University
  • UK Research and Innovation (UKRI) (EP/Y029135/1)
  • UK Research and Innovation (UKRI) (EP/Y029216/1)
  • German research council (DFG) (CH 1672/3-1)
  • Engineering and Physical Sciences Research Council (EPSRC) (EP/R025193/1)
  • Engineering and Physical Sciences Research Council (EPSRC) (EP/S004947/1)
  • Engineering and Physical Sciences Research Council (EPSRC) (EP/T028513/1)
  • Engineering and Physical Sciences Research Council (EPSRC) (EP/X038777/1)

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