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Title: Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy

Abstract

We fabricated perovskite quantum dot solar cells (PQDSCs) and varied the thickness of the QD layer by controlling the number of deposition cycles; the cells were systematically investigated with impedance spectroscopy. Despite the evident structural differences with respect to standard perovskite solar cells (PSCs), similar impedance spectra were obtained for PQDSCs, pointing to similar working principles in terms of the active layer. We distinguish two different regimes: At low illumination, recombination is ruled by multiple trapping with trap distributions and/or shunting. However, at higher light intensities, Shockley-Read-Hall recombination is observed. In addition, the low-frequency capacitance, CLF, of PQDSCs increases several orders of magnitude when the illumination is varied from dark to 1-sun conditions. This feature has not been observed in other kinds of photovoltaic devices and is characteristic of PSCs. Although there is no consensus about the exact mechanism responsible for CLF, the suggested models point to an ion migration origin. Its observation in thin-film and PQDSCs devices implies a similar effect in both.

Authors:
 [1];  [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [2]
  1. Univ. Jaume I, Castellon (Spain); Amirkabir Univ. of Technology, Tehran (Iran)
  2. Univ. Jaume I, Castellon (Spain)
  3. Amirkabir Univ. of Technology, Tehran (Iran)
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1491374
Report Number(s):
NREL/JA-5900-72790
Journal ID: ISSN 2380-8195
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; perovskite quantum dot solar cells; quantum dots; impedance spectroscopy

Citation Formats

Zolfaghari, Zahra, Hassanabadi, Ehsan, Pitarch-Tena, Didac, Yoon, Seog Joon, Shariatinia, Zahra, van de Lagemaat, Jao, Luther, Joseph M., and Mora-Seró, Iván. Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy. United States: N. p., 2018. Web. doi:10.1021/acsenergylett.8b02157.
Zolfaghari, Zahra, Hassanabadi, Ehsan, Pitarch-Tena, Didac, Yoon, Seog Joon, Shariatinia, Zahra, van de Lagemaat, Jao, Luther, Joseph M., & Mora-Seró, Iván. Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy. United States. doi:10.1021/acsenergylett.8b02157.
Zolfaghari, Zahra, Hassanabadi, Ehsan, Pitarch-Tena, Didac, Yoon, Seog Joon, Shariatinia, Zahra, van de Lagemaat, Jao, Luther, Joseph M., and Mora-Seró, Iván. Mon . "Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy". United States. doi:10.1021/acsenergylett.8b02157.
@article{osti_1491374,
title = {Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy},
author = {Zolfaghari, Zahra and Hassanabadi, Ehsan and Pitarch-Tena, Didac and Yoon, Seog Joon and Shariatinia, Zahra and van de Lagemaat, Jao and Luther, Joseph M. and Mora-Seró, Iván},
abstractNote = {We fabricated perovskite quantum dot solar cells (PQDSCs) and varied the thickness of the QD layer by controlling the number of deposition cycles; the cells were systematically investigated with impedance spectroscopy. Despite the evident structural differences with respect to standard perovskite solar cells (PSCs), similar impedance spectra were obtained for PQDSCs, pointing to similar working principles in terms of the active layer. We distinguish two different regimes: At low illumination, recombination is ruled by multiple trapping with trap distributions and/or shunting. However, at higher light intensities, Shockley-Read-Hall recombination is observed. In addition, the low-frequency capacitance, CLF, of PQDSCs increases several orders of magnitude when the illumination is varied from dark to 1-sun conditions. This feature has not been observed in other kinds of photovoltaic devices and is characteristic of PSCs. Although there is no consensus about the exact mechanism responsible for CLF, the suggested models point to an ion migration origin. Its observation in thin-film and PQDSCs devices implies a similar effect in both.},
doi = {10.1021/acsenergylett.8b02157},
journal = {ACS Energy Letters},
number = 1,
volume = 4,
place = {United States},
year = {2018},
month = {12}
}

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