期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 42, 页码 37395-37401出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b10398
关键词
interfacial fracture energy; surface energy; work of adhesion; buffer layer; organic solar cell
资金
- Basic Science Research Program [2015R1A1A1A05001115, 2015R1A2A2A01006689, 2015M1A2A2057509]
- Wearable Platform Materials Technology Center - National Research Foundation under the Ministry of Science, 387ICT and Future Planning [2016R1A5A1009926]
Here, we demonstrate the cooptimization of the interfacial fracture energy and power conversion efficiency (PCE) of poly[N-9'-heptadecany1-2,7-carbazole-alt-5,5-(4',7'di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT)-based organic solar cells (OSCs) by surface treatments of the buffer layer. The investigated surface treatments of the buffer layer simultaneously changed the crack path and interfacial fracture energy of OSCs under mechanical stress and the work function of the buffer layer. To investigate the effects of surface treatments, the work of adhesion values were calculated and matched with the experimental results based on the Owens-Wendt model. Subsequently, we fabricated OSCs on surface treated buffer layers. In particular, ZnO layers treated with poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7(9,9-dioctylfluorene)] (PFN) simultaneously satisfied the high mechanical reliability and PCE of OSCs by achieving high work of adhesion and optimized work function.
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