A new strategy for fabricating organic photovoltaic devices with stable D/A double-channel network to enhance performance using self-assembling all-conjugated diblock copolymer
| Autor: | Wei-Chih Chen, Wei-Shin Liou, Yu-Ping Lee, Chi-An Dai, Chi-Ju Chiang, Leeyih Wang, Yi-Huan Lee, Kuo-Chang Kau |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Organic solar cell Renewable Energy Sustainability and the Environment business.industry Photovoltaic system Energy conversion efficiency Hybrid solar cell Polymer solar cell law.invention law Solar cell Polymer chemistry Optoelectronics Grazing-incidence small-angle scattering General Materials Science Thermal stability Electrical and Electronic Engineering business |
| Zdroj: | Nano Energy. 13:103-116 |
| ISSN: | 2211-2855 |
| Popis: | In this study, we demonstrate the cooperative self-assembly of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) and an all-conjugated poly(2,5-dihexyloxy-p-phenylene)-b-poly(3-hexylthiophene) (PPP-P3HT) block copolymer to yield organic photovoltaic devices with enhanced solar cell performance and long-term stability. By a combination of TEM, GISAXS and GIWAXS structural investigations, it was found that a PPP-P3HT/PCBM hybrid film adopts a donor/acceptor (D/A) double-channel network (DCN) structure via simple spin-coating by self-organizing highly ordered and long-ranged crystalline P3HT nanofibrils as a hole-transporting channel, and the surrounding amorphous PPP domain with PCBM confined and dispersed within as the other electron-transporting channel. As a consequence of the structural development, the block copolymer hybrid solar cells could afford significant improvements in the charge transporting property and enhanced exciton separation, leading to a substantial improvement in the power conversion efficiency (PCE) of the resulting device. The photovoltaic devices with the DCN structure gave a high average PCE of 3.43% as compared to only 2.77% from a conventional P3HT/PCBM bulk heterojuction (BHJ) solar cell. Notably, the DCN solar cell showed significant improvements in thermal stability over the P3HT/PCBM BHJ solar cell in accelerated testing experiments. This enhancement is believed to be due to the nanoconfinement effect of the double-channel structure on the PCBM molecules, thereby averting PCBM aggregation problems typically occurring in BHJ devices. These results show promise for the practical usage of all-conjugated block copolymers with different main chain moieties towards the fabrication of organic photovoltaic devices with superior stability and competitive optoelectronic properties. |
| Databáze: | OpenAIRE |
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