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Title: Regulating surface potential maximizes voltage in all-perovskite tandems

Journal Article · · Nature (London)
ORCiD logo [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [4];  [2]; ORCiD logo [5];  [5];  [2]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1];  [6];  [1]; ORCiD logo [6];  [6]; ORCiD logo [7];  [7];  [6] more »; ORCiD logo [5];  [8];  [8]; ORCiD logo [7]; ORCiD logo [5]; ORCiD logo [8]; ORCiD logo [6]; ORCiD logo [9] « less
  1. University of Toronto, ON (Canada)
  2. Univ. of Toronto, ON (Canada)
  3. Univ. of Toronto, ON (Canada); Univ. of Toledo, OH (United States)
  4. Univ. of Toronto, ON (Canada); Northwestern Univ., Evanston, IL (United States)
  5. King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  6. University of Toledo, OH (United States)
  7. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  8. Northwestern University, Evanston, IL (United States)
  9. University of Toronto, ON (Canada); Northwestern University, Evanston, IL (United States)

The open circuit voltage (VOC) deficit in perovskite solar cells (PSCs) is greater in wide bandgap (>1.7 eV) cells than in ~1.5 eV perovskites. Quasi-Fermi level splitting (QFLS) measurements reveal VOC-limiting recombination at the electron transport layer (ETL) contact. This, we find, stems from inhomogeneous surface potential and poor perovskite-ETL energetic alignment. Common monoammonium surface treatments fail to address this; instead we introduce diammonium molecules to modify the perovskite surface states and achieve a more uniform spatial distribution of surface potential. Using 1,3-propane diammonium (PDA), QFLS increases by 90 meV, enabling 1.79 eV PSCs with a certified 1.33 V VOC, and > 19% power conversion efficiency (PCE). Incorporating this layer into a monolithic all-perovskite tandem, we report a record VOC of 2.19 V (89% of the Detailed Balance VOC limit) and > 27% PCE (26.3% certified quasi-steady-state). Furthermore, these tandems retain more than 86% of their initial PCE after 500 hrs operation.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
Grant/Contract Number:
EE0008753; AC36-08GO28308
OSTI ID:
1900407
Alternate ID(s):
OSTI ID: 1903181
Report Number(s):
NREL/JA-5900-83296
Journal Information:
Nature (London), Vol. 613, Issue 7945; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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