ITO-free inverted polymer solar cells using a GZO cathode modified by ZnO

Soo Ghang Ihn, Kyung Sik Shin, Mi Jin Jin, Xavier Bulliard, Sungyoung Yun, Yeong Suk Choi, Yungi Kim, Jong Hwan Park, Myungsun Sim, Min Kim, Kilwon Cho, Tae Sang Kim, Dukhyun Choi, Jae Young Choi, Woong Choi, Sang Woo Kim

Research output: Contribution to journalArticlepeer-review


A gallium-doped ZnO (GZO) layer was investigated and compared with a conventional indium-tin-oxide (ITO) layer for use as a cathode in an inverted polymer solar cell based on poly(3-hexylthiophene) (P3HT):[6,6]-phenyl-C 61 butyric acid methyl ester (PCBM) bulk heterojunctions (BHJ). By modifying the GZO cathode with a ZnO thin layer, a high power conversion efficiency (3.4%) comparable to that of an inverted solar cell employing the same P3HT:PCBM BHJ photoactive layer with a conventional ITO/ZnO cathode was achieved. This result indicates that GZO is a transparent electrode material that can potentially be used to replace high-cost ITO.

Original languageEnglish
Pages (from-to)1610-1614
Number of pages5
JournalSolar Energy Materials and Solar Cells
Issue number7
Publication statusPublished - 2011 Jul

Bibliographical note

Funding Information:
S.-G.I. and K.-S.S. contributed equally to this work. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2010-0015035 and 2009-0077682 ) and by the New and Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (no. 2009T100100614 ), and also by Samsung Research Fund, Sungkyunkwan University ( S-2010-0675-000 ).

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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