Perovskite Quantum Dot Photovoltaic Materials beyond the Reach of Thin Films: Full-Range Tuning of A-Site Cation Composition

Joseph Luther, Qian Zhao, Elizabeth Gaulding, Jeffrey Christians, Benjia Dou, Taylor Moot, Joseph Berry, Justin Johnson, Abhijit Hazarika, Ashley Marshall

Research output: Contribution to journalArticlepeer-review

178 Scopus Citations

Abstract

We present a cation-exchange approach for tunable A-site alloys of cesium (Cs+) and formamidinium (FA+) lead triiodide perovskite nanocrystals that enables the formation of compositions spanning the complete range of Cs1-xFAxPbI3, unlike thin-film alloys or the direct synthesis of alloyed perovskite nanocrystals. These materials show bright and finely tunable emission in the red and near-infrared range between 650 and 800 nm. The activation energy for the miscibility between Cs+ and FA+ is measured (∼0.65 eV) and is shown to be higher than reported for X-site exchange in lead halide perovskites. We use these alloyed colloidal perovskite quantum dots to fabricate photovoltaic devices. In addition to the expanded compositional range for Cs1-xFAxPbI3 materials, the quantum dot solar cells exhibit high opencircuit voltage (VOC) with a lower loss than the thin-film perovskite devices of similar compositions.

Original languageAmerican English
Pages (from-to)10327-10337
Number of pages11
JournalACS Nano
Volume12
Issue number10
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society. All rights reserved.

NREL Publication Number

  • NREL/JA-5900-71956

Keywords

  • A-site alloying
  • cation exchange
  • lead halide
  • nanocrystals
  • perovskites
  • quantum dots
  • solar cells

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