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Title: Low-bandgap mixed tin–lead iodide perovskite absorbers with long carrier lifetimes for all-perovskite tandem solar cells

Journal Article · · Nature Energy
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [4];  [5];  [6];  [1]
  1. Univ. of Toledo, OH (United States). Wright Center for Photovoltaics Innovation and Commercialization (PVIC)
  2. Univ. of Toledo, OH (United States). Wright Center for Photovoltaics Innovation and Commercialization (PVIC); Wuhan Univ. (China). Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education, School of Physics and Technology
  3. Univ. of Toledo, OH (United States). Wright Center for Photovoltaics Innovation and Commercialization (PVIC); Southeast Univ., Nanjing (China). Ordered Matter Science Research Center
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center
  5. Wuhan Univ. (China). Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education, School of Physics and Technology
  6. Southeast Univ., Nanjing (China). Ordered Matter Science Research Center

Tandem solar cells using only metal-halide perovskite sub-cells are an attractive choice for next-generation solar cells. However, the progress in developing efficient all-perovskite tandem solar cells has been hindered by the lack of high-performance low-bandgap perovskite solar cells. Here in this paper, we report efficient mixed tin-lead iodide low-bandgap (~1.25 eV) perovskite solar cells with open-circuit voltages up to 0.85 V and over 70% external quantum efficiencies in the infrared wavelength range of 700-900 nm, delivering a short-circuit current density of over 29 mA cm-2 and demonstrating suitability for bottom-cell applications in all-perovskite tandem solar cells. Our low-bandgap perovskite solar cells achieve a maximum power conversion efficiency of 17.6% and a certified efficiency of 17.01% with a negligible current-voltage hysteresis. Finally, when mechanically stacked with a ~1.58 eV bandgap perovskite top cell, our best all-perovskite 4-terminal tandem solar cell shows a steady-state efficiency of 21.0%.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S). SunShot Initiative; USDOE Office of Science (SC)
Grant/Contract Number:
AC36-08GO28308; AC02-05CH11231
OSTI ID:
1371834
Report Number(s):
NREL/JA-5900-68901; MainId:17308; UUID:6fe33abc-0f68-e711-9c0f-2c44fd93e385; MainAdminID:5786
Journal Information:
Nature Energy, Journal Name: Nature Energy Journal Issue: 4 Vol. 2; ISSN 2058-7546
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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