Scholarlink

<p>Selenium (Se), the world’s oldest photovoltaic material, is experiencing a resurgence in interest due to its intrinsic wide bandgap of approximately 1.9 eV, making it an ideal photoabsorber for the top cell in tandem solar cells and for indoor photovoltaics. However, the power conversion efficiency of Se solar cells remains constrained by severe non-radiative recombination losses caused by the small grain size (~500 nm) of conventionally thermally annealed Se films. Here we report an illumination-assisted annealing strategy that enables photo-induced crystallization at ambient temperature while suppressing dewetting, followed by subsequent thermal annealing, to fabricate Se films with large grains (~2.7 μm), a low trap-state density (6.9 × 10¹⁴ cm⁻³) and a long carrier lifetime (22.9 ns). The resultant Se solar cells achieve a certified power conversion efficiency of 10.3% with a 1.03 V open-circuit voltage. Unencapsulated devices exhibit negligible performance loss after 1,000 h under maximum power point tracking in ambient conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Illumination-assisted annealing enables selenium solar cells with open-circuit voltage over 1 V and efficiency exceeding 10%

  • 期刊论文

  • 发表日期：

    2026年1月7日

查看全文
  • Xin Wen,
  • Zongbao Li,
  • Wenbo Lu,
  • Jianjun Li,
  • Weiwei Xie,
  • Zhouqing Wei,
  • Shunchang Liu,
  • Qingxiang Liu,
  • Xiaoyan An,
  • Mingjie Feng,
  • Gang Liu,
  • Jin-Song Hu,
  • Yi Hou,
  • Ding-Jiang Xue,
  • Li-Jun Wan

摘要

Selenium (Se), the world’s oldest photovoltaic material, is experiencing a resurgence in interest due to its intrinsic wide bandgap of approximately 1.9 eV, making it an ideal photoabsorber for the top cell in tandem solar cells and for indoor photovoltaics. However, the power conversion efficiency of Se solar cells remains constrained by severe non-radiative recombination losses caused by the small grain size (~500 nm) of conventionally thermally annealed Se films. Here we report an illumination-assisted annealing strategy that enables photo-induced crystallization at ambient temperature while suppressing dewetting, followed by subsequent thermal annealing, to fabricate Se films with large grains (~2.7 μm), a low trap-state density (6.9 × 10¹⁴ cm⁻³) and a long carrier lifetime (22.9 ns). The resultant Se solar cells achieve a certified power conversion efficiency of 10.3% with a 1.03 V open-circuit voltage. Unencapsulated devices exhibit negligible performance loss after 1,000 h under maximum power point tracking in ambient conditions.