Hybrid polymer-CdSe solar cells with a ZnO nanoparticle buffer layer for improved efficiency and lifetime

Lei Qian, Jihua Yang, Renjia Zhou, Aiwei Tang, Ying Zheng, Teng Kuan Tseng, Debasis Bera, Jiangeng Xue, Paul H. Holloway

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

We report the use of a solution-processed ZnO nanoparticle buffer layer in hybrid solar cells based on blends of poly(3-hexylthiophene) (P3HT) and CdSe quantum dots. Depending on the size of the CdSe nanocrystal, these devices exhibit 20-70% higher photocurrent output than similar devices without the ZnO nanoparticle layer, which is attributed to a combination of electronic and optical effects. With negligible change in open-circuit voltage and a small increase in the fill factor, the power conversion efficiency of these P3HT:CdSe hybrid solar cells was increased by 30-80% with incorporation of the ZnO nanoparticle layer. The presence of the ZnO nanoparticle layer also drastically improves the stability of these hybrid solar cells. Less than 40% loss in efficiency was observed for such devices after 70 days of exposure to the laboratory ambient without any type of encapsulation.

Original languageEnglish (US)
Pages (from-to)3814-3817
Number of pages4
JournalJournal of Materials Chemistry
Volume21
Issue number11
DOIs
StatePublished - Mar 21 2011

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