Toward Long-Term Stable and Efficient Large-Area Organic Solar Cells

Pei Ting Tsai, Kuan Chu Lin, Cheng Yu Wu, Chung Hung Liao, Man Chun Lin, Ying Qian Wong, Hsin Fei Meng, Chih Yu Chang, Chien Lung Wang, Yi Fan Huang, Sheng Fu Horng, Hsiao Wen Zan, Yu Chiang Chao

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Here, we report that long-term stable and efficient organic solar cells (OSCs) can be obtained through the following strategies: i) combination of rapid-drying blade-coating deposition with an appropriate thermal annealing treatment to obtain an optimized morphology of the active layer; ii) insertion of interfacial layers to optimize the interfacial properties. The resulting devices based on poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b′]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-2-carboxylate-2,6-diyl)] (PBDTTT-EFT):[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) blend as the active layer exhibits a power conversion efficiency (PCE) up to 9.57 %, which represents the highest efficiency ever reported for blade-coated OSCs. Importantly, the conventional structure devices based on poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester (PCBM) blend can retain approximately 65 % of their initial PCE for almost 2 years under operating conditions, which is the best result ever reported for long-term stable OSCs under operational conditions. More encouragingly, long-term stable large-area OSCs (active area=216 cm2) based on P3HT:PCBM blend are also demonstrated. Our findings represent an important step toward the development of large-area OSCs with high performance and long-term stability.

Original languageEnglish
Pages (from-to)2778-2787
Number of pages10
Issue number13
Publication statusPublished - Jan 1 2017
Externally publishedYes


  • annealing
  • blade coating
  • organic solar cells
  • power conversion efficiency
  • stability

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemical Engineering
  • General Materials Science
  • General Energy


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