PbSe quantum dot passivated via mixed halide perovskite nanocrystals for solar cells with over 9% efficiency

Long Hu, Zhilong Zhang, Robert J. Patterson, Sunil B. Shivarudraiah, Zhicong Zhou, Michael Ng, Shujuan Huang, Jonathan E. Halpert

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

PbSe quantum dots (QDs) have stronger electronic coupling resulting from a large Bohr exciton radius, suggesting PbSe QDs may be able to achieve superior charge separation and transport in optoelectronic devices compared with PbS QDs. However, PbS QDs solar cell have achieved a certified 12.01% power conversion efficiency (PCE), whereas PbSe QD photovoltaics lag behind at 8.2% PCE. One reason for this difference is that there has been significantly less work done on surface passivation of PbSe QDs. Here, the surface passivation of chlorinated PbSe QDs is optimized via a halide ion exchange treatment using mixed halide CsPb(Br/I)3 perovskite nanocrystals. Champion devices made from treated QDs achieved a PCE of 9.2%, Voc of 0.56 V, Jsc of 25.7 mA cm−2, and fill factor of 64%. Average PCEs for optimized cells are 8.9%. Detailed physical characterizations including capacitance‐voltage (C‐V), Voc, and Jsc as a function of light intensity, transient photovoltage, and photocurrent measurements are all carried out to investigate the mechanism of the improvement in the PCE and to understand the role of the mixed halide perovskites in providing superior surface passivation for PbSe solar cells. At this time, 9.2% is the highest PCE yet reported for PbSe QDs solar cells.
Original languageEnglish
Article number1800234
Number of pages8
JournalSolar RRL
Volume2
Issue number12
DOIs
Publication statusPublished - Dec 2018
Externally publishedYes

Bibliographical note

The name of the author Shujuan Huang is spelled as Shujuang Huang in the article.

Keywords

  • high efficiency
  • ion exchange
  • PbSe quantum dot
  • perovskite quantum dot
  • solar cell

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