Incorporation of potassium at CuPc/C60 interface for photovoltaic application

This letter demonstrates the effect of potassium (K) doping at the donor–acceptor interface of CuPc/C60-based organic solar cells. Power conversion efficient (PCE) doubled when a little K was doped into the CuPc/C60 interface and the device was postannealed (75 °C, 10 min). Changes in binding energi...

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Veröffentlicht in:Applied physics letters 2011-03, Vol.98 (11)
Hauptverfasser: Shih, Chuan-Feng, Hung, Kuang-Teng, Chen, Hui-Ju, Hsiao, Chu-Yun, Huang, Kuan-Ta, Chen, Szu-Hung
Format: Artikel
Sprache:eng
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Zusammenfassung:This letter demonstrates the effect of potassium (K) doping at the donor–acceptor interface of CuPc/C60-based organic solar cells. Power conversion efficient (PCE) doubled when a little K was doped into the CuPc/C60 interface and the device was postannealed (75 °C, 10 min). Changes in binding energies, depletion capacitance, and mobilities of electrons and holes were investigated. The marked improvement of PCE arose mostly from the increase in short-circuit current, owing to the modified charge transfer process.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3568884