High Efficiency Perovskite Quantum Dot Solar Cells with Charge Separating Heterostructure

Qian Zhao, Abhijit Hazarika, Xihan Chen, Steve P. Harvey, Bryon W. Larson, Glenn R. Teeter, Jun Liu, Tao Song, Chuanxiao Xiao, Liam Shaw, Minghui Zhang, Guoran Li, Matthew C. Beard, Joseph M. Luther

Research output: Contribution to journalArticlepeer-review

327 Scopus Citations

Abstract

Metal halide perovskite semiconductors possess outstanding characteristics for optoelectronic applications including but not limited to photovoltaics. Low-dimensional and nanostructured motifs impart added functionality which can be exploited further. Moreover, wider cation composition tunability and tunable surface ligand properties of colloidal quantum dot (QD) perovskites now enable unprecedented device architectures which differ from thin-film perovskites fabricated from solvated molecular precursors. Here, using layer-by-layer deposition of perovskite QDs, we demonstrate solar cells with abrupt compositional changes throughout the perovskite film. We utilize this ability to abruptly control composition to create an internal heterojunction that facilitates charge separation at the internal interface leading to improved photocarrier harvesting. We show how the photovoltaic performance depends upon the heterojunction position, as well as the composition of each component, and we describe an architecture that greatly improves the performance of perovskite QD photovoltaics.

Original languageAmerican English
Article number2842
Number of pages8
JournalNature Communications
Volume10
Issue number1
DOIs
StatePublished - 1 Dec 2019

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

NREL Publication Number

  • NREL/JA-5900-73275

Keywords

  • quantum dots
  • solar cells

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