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Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells

Journal Article · · Science
 [1];  [2];  [3];  [4];  [1];  [1];  [5];  [1];  [1];  [1];  [1];  [6];  [1];  [5];  [1];  [7];  [5];  [6];  [4];  [8] more »;  [3];  [1] « less
  1. Rice Univ., Houston, TX (United States)
  2. Rice Univ., Houston, TX (United States); Guangzhou University (China)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Purdue Univ., West Lafayette, IN (United States)
  5. Univ. of Washington, Seattle, WA (United States)
  6. Univ. of Rennes (France). Institut des Sciences Chimiques de Rennes (UMR CNRS)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Univ. of Rennes (France); Institut National des Sciences Appliquées (INSA), Rennes (France)

Realizing solution-processed heterostructures is a long-enduring challenge in halide perovskites because of solvent incompatibilities that disrupt the underlying layer. By leveraging the solvent dielectric constant and Gutmann donor number, we could grow phase-pure two-dimensional (2D) halide perovskite stacks of the desired composition, thickness, and bandgap onto 3D perovskites without dissolving the underlying substrate. Characterization reveals a 3D–2D transition region of 20 nanometers mainly determined by the roughness of the bottom 3D layer. Thickness dependence of the 2D perovskite layer reveals the anticipated trends for n-i-p and p-i-n architectures, which is consistent with band alignment and carrier transport limits for 2D perovskites. Here we measured a photovoltaic efficiency of 24.5%, with exceptional stability of T99 (time required to preserve 99% of initial photovoltaic efficiency) of >2000 hours, implying that the 3D/2D bilayer inherits the intrinsic durability of 2D perovskite without compromising efficiency.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); European Union (EU); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; SC0013957
OSTI ID:
1909609
Journal Information:
Science, Journal Name: Science Journal Issue: 6613 Vol. 377; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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