Reduced recombination with an optimized barrier layer on TiO2 in PbS/CdS core shell quantum dot sensitized solar cells

Dinah Punnoose, C. H.S.S. Pavan Kumar, Hyun Woong Seo, Masaharu Shiratani, Araveeti Eswar Reddy, S. Srinivasa Rao, Chebrolu Venkata Thulasi-Varma, Soo Kyoung Kim, Sang Hwa Chung, Hee Je Kim

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Fast electron transport and slow interfacial electron recombination are indispensable features for efficient photo-electrodes of quantum dot sensitized solar cells (QDSSCs). This study reports the methodology to prevent recombination losses in lead sulfide QDSSCs. TiO2 nano-particles were coated with two different insulating oxide materials (MgO and Al2O3). Single- and-double coated barrier layers are used in order to optimize the passivation effect, prevent recombination losses and to obtain high-performance stable QDSSCs when compared to bare TiO2. Metal oxides with a high isoelectric point enhance quantum dot adsorption and also increase the TiO2 conduction band edge. QDSSCs are examined in detail using a polysulfide electrolyte and a copper sulfide (CuS) counter electrode. A solar cell based on a double coating electrode (MgO/Al2O3) yielded excellent performance with an efficiency (η) of 3.25%. The increase in electron transport and the decrease in electron recombination are responsible for the enhanced JSC and VOC of QDSSCs. The electron lifetime with TiO2/MgO/Al2O3 was higher than those with bare TiO2, TiO2/MgO, TiO2/Al2O3 and TiO2/Al2O3/MgO leading to a more efficient electron-hole separation and slows down electron recombination.

Original languageEnglish
Pages (from-to)3423-3431
Number of pages9
JournalNew Journal of Chemistry
Issue number4
Publication statusPublished - Apr 1 2016

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

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