ChemSusChem
ChemSusChem
5 years ago

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

Toward Long-Term Stable and Efficient Large-Area Organic Solar Cells
Man-Chun Lin, Chien-Lung Wang, Hsin-Fei Meng, Ying Qian Wong, Yu-Chiang Chao, Chih-Yu Chang, Cheng-Yu Wu, Kuan-Chu Lin, Pei-Ting Tsai, Hsiao-Wen Zan, Sheng-Fu Horng, Yi-Fan Huang, Chung-Hung Liao
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. Long operational lifetime: long-term stable and efficient large-area organic solar cells are demonstrated by employing an integrated approach, including the combination of blade-coating deposition with an appropriate thermal annealing treatment to obtain an optimized morphology of the active layer and the insertion of interfacial layers to optimize the interfacial properties between the active layer and the electrode.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700601

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