Origin of the enhanced photovoltaic characteristics of PbS thin film solar cells processed at near room temperature

Deuk Ho Yeon, Seung Min Lee, Yeon Hwa Jo, Jooho Moon, Yong Soo Cho

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

An enhanced conversion efficiency of ∼3.10% for PbS/CdS thin film solar cells without the involvement of quantum dots is demonstrated by focusing on the origin of the enhancement. The optical band gap of the PbS absorber is optimized toward a higher value by utilizing near room temperature deposition in chemical baths. Only the highest band gap of ∼1.61 eV for p-type PbS, which was obtained at 40°C, results in a promising band alignment with an n-type CdS layer for effective light absorption and charge transfer. Both open circuit voltage and current density increase substantially to 280 mV and 20.93 mA cm-2, respectively, with the ideal adjustment of the relative band gaps. The variations in crystallite size, surface roughness, the stoichiometry ratio of S/Pb and carrier concentration are discussed as key parameters in relation to the improved band alignment and photovoltaic properties.

Original languageEnglish
Pages (from-to)20112-20117
Number of pages6
JournalJournal of Materials Chemistry A
Volume2
Issue number47
DOIs
Publication statusPublished - 2014 Dec 21

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Energy gap
Optical band gaps
Open circuit voltage
Crystallite size
Stoichiometry
Light absorption
Semiconductor quantum dots
Conversion efficiency
Carrier concentration
Charge transfer
Current density
Surface roughness
Temperature
Thin film solar cells

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

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abstract = "An enhanced conversion efficiency of ∼3.10{\%} for PbS/CdS thin film solar cells without the involvement of quantum dots is demonstrated by focusing on the origin of the enhancement. The optical band gap of the PbS absorber is optimized toward a higher value by utilizing near room temperature deposition in chemical baths. Only the highest band gap of ∼1.61 eV for p-type PbS, which was obtained at 40°C, results in a promising band alignment with an n-type CdS layer for effective light absorption and charge transfer. Both open circuit voltage and current density increase substantially to 280 mV and 20.93 mA cm-2, respectively, with the ideal adjustment of the relative band gaps. The variations in crystallite size, surface roughness, the stoichiometry ratio of S/Pb and carrier concentration are discussed as key parameters in relation to the improved band alignment and photovoltaic properties.",
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Origin of the enhanced photovoltaic characteristics of PbS thin film solar cells processed at near room temperature. / Yeon, Deuk Ho; Lee, Seung Min; Jo, Yeon Hwa; Moon, Jooho; Cho, Yong Soo.

In: Journal of Materials Chemistry A, Vol. 2, No. 47, 21.12.2014, p. 20112-20117.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Origin of the enhanced photovoltaic characteristics of PbS thin film solar cells processed at near room temperature

AU - Yeon, Deuk Ho

AU - Lee, Seung Min

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AU - Moon, Jooho

AU - Cho, Yong Soo

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AB - An enhanced conversion efficiency of ∼3.10% for PbS/CdS thin film solar cells without the involvement of quantum dots is demonstrated by focusing on the origin of the enhancement. The optical band gap of the PbS absorber is optimized toward a higher value by utilizing near room temperature deposition in chemical baths. Only the highest band gap of ∼1.61 eV for p-type PbS, which was obtained at 40°C, results in a promising band alignment with an n-type CdS layer for effective light absorption and charge transfer. Both open circuit voltage and current density increase substantially to 280 mV and 20.93 mA cm-2, respectively, with the ideal adjustment of the relative band gaps. The variations in crystallite size, surface roughness, the stoichiometry ratio of S/Pb and carrier concentration are discussed as key parameters in relation to the improved band alignment and photovoltaic properties.

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