A three-dimensional quantum dot network stabilizes perovskite solids via hydrostatic strain

Yuan Liu, Tong Zhu, Luke Grater, Hao Chen, Roberto dos Reis, Aidan Maxwell, Matthew Cheng, Yitong Dong, Sam Teale, Adam F.G. Leontowich, Chang Yong Kim, Phoebe Tsz shan Chan, Mingcong Wang, Watcharaphol Paritmongkol, Yajun Gao, So Min Park, Jian Xu, Jafar Iqbal Khan, Frédéric Laquai, Gilbert C. WalkerVinayak P. Dravid, Bin Chen*, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Compressive strain engineering improves perovskite stability. Two-dimensional compressive strain along the in-plane direction can be applied to perovskites through the substrate; however, this in-plane strain results in an offsetting tensile strain perpendicular to the substrate, linked to the positive Poisson ratio of perovskites. Substrate-induced strain engineering has not yet resulted in state-of-the-art operational stability. Here, we seek instead to implement hydrostatic strain in perovskites by embedding lattice-mismatched perovskite quantum dots (QDs) into a perovskite matrix. QD-in-matrix perovskites show a homogeneously strained lattice as evidenced by grazing-incidence X-ray diffraction. We fabricate mixed-halide wide-band-gap (Eg; 1.77 eV) QD-in-matrix perovskite solar cells that maintain >90% of their initial power conversion efficiency (PCE) after 200 h of one-sun operation at the maximum power point (MPP), a significant improvement relative to matrix-only devices, which lose 10% (relative) of their initial PCE after 5 h of MPP tracking.

Original languageEnglish (US)
Pages (from-to)107-122
Number of pages16
Issue number1
StatePublished - Jan 3 2024


  • Hydrostatic strain
  • MAP 2: Benchmark
  • Mixed-halide perovskites
  • Photovoltaics
  • Quantum dot-in-matrix
  • Strain engineering

ASJC Scopus subject areas

  • General Materials Science


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