4.8 Article

Immediate and Temporal Enhancement of Power Conversion Efficiency in Surface-Passivated Perovskite Solar Cells

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39178-39185

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c06878

Keywords

perovskite; storage; aging; passivation; interface; bulk; recombination

Funding

  1. Australian Renewable Energy Agency (ARENA) via the Australian Centre for Advanced Photovoltaics (ACAP) [2020/RND001, 2020/RND003]
  2. New Energy and Industrial Technology Development Organization (NEDO)
  3. Japan Science and Technology Agency (JST) Advanced Low Carbon Technology Research and Development Program (ALCA) [JPMJAL1603]
  4. JSPS KAKENHI [JP20F20031]
  5. Japan Society for the Promotion of Science
  6. John Hooke Chair of Nanoscience Postgraduate Research Scholarship
  7. CSIRO postgraduate research top-up scholarship

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This work explores strategies to improve power conversion efficiency (PCE) in perovskite solar cells by utilizing storage effects, interface passivation, and composition engineering, highlighting the importance of reducing trap density and intrinsic defects in the perovskite bulk. By understanding dominant charge recombination mechanisms, immediate and temporal PCE enhancements were achieved, leading to highly efficient PSCs.
This work reports strategies for improving the power conversion efficiency (PCE) by capitalizing on temporal changes through the storage effect and immediate improvements by interface passivation. It is demonstrated that both strategies can be combined as shown by PCE improvement in passivated perovskite solar cells (PSCs) upon ambient storage because of trap density reduction. By analyzing the dominant charge recombination process, we find that lead-related traps in perovskite bulk, rather than at the surface, are the recombination centers in both as-fabricated and ambient-stored passivated PSCs. This emphasizes the necessity to reduce intrinsic defects in the perovskite bulk. Furthermore, storage causes temporal changes in band alignment even in passivated PSCs, contributing to PCE improvement. Building on these findings, composition engineering was employed to produce further immediate PCE improvements because of defect reduction in the bulk, achieving a PCE of 22.2%. These results show that understanding the dominant recombination mechanisms within a PSC is important to inform strategies for producing immediate and temporal PCE enhancements either by interface passivation, storage, composition engineering, or a combination of them all to fabricate highly efficient PSCs.

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