Integrated 4-Terminal All-Inorganic Perovskite Tandem Solar Cell with Open-Circuit Voltage Exceeding 2.1 V for Water Splitting

作者：Sun, Qiang; Zhang, Zhiguo; Zhang, Tao; Feng, Yao; Gu, Anjie; Yu, Haixuan; Zhang, Miaomiao; Zhang, Xiao Li; Zhu, Jun; Shen, Yan^*; Wang, Mingkui^*

来源：ACS Energy Letters, 2022, 7(12): 4215-4223.

DOI：10.1021/acsenergylett.2c02262

• EFFICIENT
• STABILITY
• PERFORMANCE
• LAYERS
• 24.8-PERCENT
• SUBSTITUTION
• OXIDATION

This work reports on Sn-Pb binary metal inorganic perovskites as narrow-bandgap absorbers for integrated 4-terminal all-inorganic perovskite tandem solar cells (TSCs). A series of Sn-Pb binary metal CsPb1-xSnxI3-yBry inorganic perovskites with tunable bandgaps ranging from 1.28 to 1.45 eV were synthesized through tuning the Sn-Pb and I-Br contents. The TSC device using a narrow-bandgap CsPb0.5Sn0.5I2.7Br0.3 bottom cell with a wide-bandgap semi-transparent CsPbI1.5Br1.5 top cell achieved a remarkable power conversion efficiency over 18% and a high open-circuit voltage (VOC) of 2.13 V, a very attractive feature for solar fuel production. To the best of our knowledge, this is the first trial of TSCs entirely made of all-inorganic perovskite absorbers, and also the record VOC achieved among double-junction TSCs based on integration of narrow-and wide-bandgap perovskite absorbers so far. Using this novel all-inorganic perovskite TSC in conjunction with a water-splitting system employing Pt/C for hydrogen evolution reaction and Fe/Ni foam for oxygen evolution reaction in alkaline electrolyte, we achieved an unprecedented solar-to-hydrogen efficiency over 13% under standard illumination test conditions.

• 单位
  y; 郑州大学; 华中科技大学