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

Tsai PT 1 , Lin KC 2 , Wu CY 1 , Liao CH 2 , Lin MC 2 , Wong YQ 3 Show all authors , Meng HF 1 , Chang CY 4 , Wang CL 5 , Huang YF 5 , Horng SF 2 , Zan HW 6 , Chao YC 7

Affiliations 

  • 1 Institute of Physics, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
  • 2 Institute of Electronic Engineering, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu, 300, Taiwan
  • 3 Faculty of Engineering, Multimedia University, Cyberjaya, 63100, Malaysia
  • 4 Department of Materials Science and Engineering, Feng Chia University, 100 Wen hwa Road, Taichung, 40724, Taiwan
  • 5 Department of Applied Chemistry, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
  • 6 Deparment of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
  • 7 Department of Physics, Chung Yuan Christian University, 200 Chung Pei Road, Chung Li, 32023, Taiwan
ChemSusChem, 2017 07 10;10(13):2778-2787.
PMID: 28516516 DOI: 10.1002/cssc.201700601

Abstract

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 (PC71 BM) 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.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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