Efficient bilayer polymer solar cells possessing planar mixed-heterojunction structures

Jen Hsien Huang, Kuang Chieh Li, Dhananjay Kekuda, Hari Hara Padhy, Hong Cheu Lin, Kuo Chuan Ho, Chih Wei Chu

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We have investigated the influence of thermal annealing on the performance of polymer bilayer solar cell devices incorporating poly{2,6-(4,4-bis[2- ethylhexyl]-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7-(2,1, 3-benzothiadiazole)} (PCPDTTBT) as the donor and two kinds of fullerenes (C 60, C70) as acceptors. The higher absorption of C 70 increased the external quantum efficiency in the spectral range 400-600 nm. We observed morphological changes of the polymer films when the pre-annealing temperature was near the crystalline temperature (Tc, 207°C). These nanostructural transformations resulted in a modified interfacial morphology of the donor phases and, therefore, greatly influenced the device performance. Post-annealing treatment reorganized the interface between the donor and acceptor phases, leading to better contact. The highest power conversion efficiency (2.85%) was obtained when we performed device pre- and post-annealing both at 200°C for 30 min; the open-circuit voltage was 0.69 V and the short-circuit current was 8.42 mA cm-2.

Original languageEnglish
Pages (from-to)3295-3300
Number of pages6
JournalJournal of Materials Chemistry
Volume20
Issue number16
DOIs
Publication statusPublished - 09-04-2010

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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