Morphologically Stable Donor-Acceptor Hybrids based on Self-Assembled Conjugated Block Copolymer

Hsiao-Chi Hsieh^a, Wei-Chih Chen^a, Chi-An Dai^a, Leeyih Wang^a

^aNational Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Leeyih Wang, 160
Publication date: 5th February 2015

Numerous studies have established that the morphology of photoactive donor/acceptor blends plays a crucial role in determining the performance of bulk heterojunction solar cells. Herein, we demonstrated a new strategy for fabricating photovoltaic devices with thermally stable and well defined double-channel (DCN) like structure by using an all-conjugated block copolymer, poly(2,5-dihexyloxy-p-phenylene)-b-poly(3-hexylthiophene) (PPP-P3HT), as an effective structure-directing template for geometrical manipulation of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) location. The combined results from TEM, GISAXS, and GIWAXS for the PPP-P3HT/PCBM hybrid film indicated that the P3HT block self-organized into highly ordered and long-ranged crystalline nanofibrils as a hole-transporting channel, and the PCBM was confined and dispersed within the surrounding amorphous PPP domain as the electron-transporting channel. The formation of the ordered DCN structure with preferential distribution of PCBM within the PPP domains could be attributed to the consequence of good miscibility between the amorphous PPP and PCBM molecules, and the segregation strength between the constituent blocks. Consequently, such system 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. More importantly, the DCN solar cell showed significant improvements in thermal stability over the P3HT/PCBM BHJ solar cell in accelerated testing experiments due to reduced formation rate of PCBM aggregations during aging process.

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