Improved performance of CdS/CdSe quantum dot-sensitized solar cells using Mn-doped PbS quantum dots as a catalyst in the counter electrode

Byung Man Kim, Min Kyu Son, Soo Kyoung Kim, Na Yeong Hong, Songyi Park, Myeong Soo Jeong, Hyunwoong Seo, Kandasamy Prabakar, Hee Je Kim

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

This study reports the enhanced catalytic ability of Mn-doped PbS QDs synthesized using a successive ionic layer adsorption and reaction (SILAR) method for quantum dot-sensitized solar cells (QDSSCs). Electrochemical and optical analysis of each material showed that the catalytic ability of the PbS electrode was improved significantly by Mn2+ doping. Two factors can explain this behavior. The first is that intentional impurities have an impact on the structure of the host material, such as increases in surface roughness. The other is that dopants create new energy states that delay the exciton recombination time and allow charge separation to be activated. As a result, the photoelectron supply from the counter electrode is accelerated, resulting in vigorous redox reactions at the polysulfide electrolyte. The performance of the CdS/CdSe QDSSC using a Mn-doped PbS counter electrode was compared with those using the Pt and PbS counter electrodes. Finally, a power conversion efficiency of 3.61% was achieved with the Mn-doped PbS counter electrode (VOC = 0.61 V, JSC = 11.67 mA cm-2, FF = 0.51) under one sun illumination (100 mW cm-2), which is ∼40% higher than that of CdS/CdSe QDSSCs with the bare PbS counter electrode.

Original languageEnglish
Pages (from-to)92-98
Number of pages7
JournalElectrochimica Acta
Volume117
DOIs
Publication statusPublished - Jan 20 2014

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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