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Depleted bulk heterojunctions in thermally annealed PbS quantum dot solar cells

Ding, B and Wang, Y and Huang, PS and Waldeck, DH and Lee, JK (2014) Depleted bulk heterojunctions in thermally annealed PbS quantum dot solar cells. Journal of Physical Chemistry C, 118 (27). 14749 - 14758. ISSN 1932-7447

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Abstract

We have studied the detailed interface structure and energy conversion behavior of TiO2/PbS heterojunction solar cells. Nanoscale structure and composition analysis have revealed that thermal annealing causes intermixing of the TiO2 and PbS phases and influences the morphologies and optical properties of the heterojunction film. This intermixing increased the junction area within the depleted bulk heterojunction (DBH) layer and promoted the carrier extraction from PbS QDs to TiO2. In addition, the thermal annealing caused interparticle necking between PbS QDs and increased the crystallinity of the PbS QD film. Compared with unannealed PbS/TiO2 heterojunction solar cells, the formation of the DBH layer and the partial sintering of PbS QDs led to a doubling of the short-circuit current (J sc) and an improved energy conversion efficiency, by 39%. Electric force microscopy analysis confirmed the presence of a DBH layer. The electron lifetime and fill factor (FF) of the solar cells decreased when the TiO 2/PbS mixed film was thermally annealed, and this was assigned to a lower recombination resistance in the DBH layer. Post-treatment of PbS/TiO 2 DBH films with ethanedithiol was found to increase the recombination resistance at PbS/TiO2 interface and to enhance the energy conversion efficiency to ∼4%. © 2014 American Chemical Society.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Ding, B
Wang, Y
Huang, PS
Waldeck, DHdave@pitt.eduDAVE
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 10 July 2014
Date Type: Publication
Journal or Publication Title: Journal of Physical Chemistry C
Volume: 118
Number: 27
Page Range: 14749 - 14758
DOI or Unique Handle: 10.1021/jp502356d
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1932-7447
Date Deposited: 23 Oct 2014 20:13
Last Modified: 02 Feb 2019 21:55
URI: http://d-scholarship.pitt.edu/id/eprint/23274

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