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Title: Research Update: Comparison of salt- and molecular-based iodine treatments of PbS nanocrystal solids for solar cells

Molecular- and salt-based chemical treatments are believed to passivate electronic trap states in nanocrystal-based semiconductors, which are considered promising for solar cells but suffer from high carrier recombination. Here, we compare the chemical, optical, and electronic properties of PbS nanocrystal-based solids treated with molecular iodine and tetrabutylammonium iodide. Surprisingly, both treatments increase—rather than decrease—the number density of trap states; however, the increase does not directly influence solar cell performance. We explain the origins of the observed impact on solar cell performance and the potential in using different chemical treatments to tune charge carrier dynamics in nanocrystal-solids.
Authors:
; ; ;  [1]
  1. Laboratory for Nanoelectronics, ETH Zurich Gloriastrasse 35, Zurich 8044 (Switzerland)
Publication Date:
OSTI Identifier:
22415248
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 2; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; ELECTRONIC STRUCTURE; IODIDES; IODINE; LEAD SULFIDES; NANOSTRUCTURES; RECOMBINATION; SEMICONDUCTOR MATERIALS; SOLAR CELLS; SOLIDS; TRAPS