Functionalized Porphyrins as New Hole-Transporting Materials for High Performance Perovskite-Based Solar Cells
Chen-Yu Yeh a, Hsien-Hsin Chou a, Chi-Lun Mai a, Hsiang-Jung Wei a, Po-Shen Shen b, Ming-Hsien Li b, Yu-Hsien Chiang b, Peter Chen b
a National Chung Hsing University, 250 Kuo-Kuang Rd. Department of Chemistry, National Chung Hsing University, Taichung, 402, Taiwan, Province of China
b Cheng Kung University, 1 University Road, Tainan, 701, Taiwan, Province of China
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Chen-Yu Yeh, 055
Publication date: 7th November 2016

Functionalized Porphyrins as New Hole-Transporting Materials for High Performance Perovskite-Based Solar CellsHsien-Hsin Chou,a Yu-Hsien Chiang,b Peter Chen,*,b and Chen-Yu Yeh*,aaDepartment of Chemistry, National Chung Hsing University, Taichung 402, Taiwanb Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan  AbstractPerovskite-based solar cells (PSCs) are the most fascinating solar-to-electricity converting technologies in the new century. The urge of searching for alternative hole-transporting materials (HTMs) for high-performance perovskite-based solar cells is growing. Recently we have developed new category of porphyrin-based hole-transporting materials which are structurally simple, easy to prepare and well performed. New zinc porphyrins Y2 and Y2A2 have been utilized in perovskite solar cells (PSCs) specifically as hole-transporting materials (HTMs) rather than photosensitizers. The combination of MAPbI3 as photosensitizer and porphyrins as HTMs is potential alternative to well-known MAPbI3/Spiro-OMeTAD hybrids owing to high performance and versatility toward molecular engineering of porphyrin families. A high efficiency of 16.60% is achieved by n-butyl tethered Y2 HTM (VOC = 0.99 V; JSC = 22.82 mA cm-2) which is comparable to that of Spiro-OMeTAD of 18.03% (VOC = 1.06 V; JSC = 22.79 mA cm-2). Both materials possess similar HOMO level and same order of magnitude of hole-mobility at 10-4 cm2 V-1 s-1. The slightly poorer performance of 10.55% (VOC = 1.01 V; JSC = 17.80 mA cm-2) is obtained for n-dodecyl tethered Y2A2 HTM. This is believed to stem from more surface pinholes while deposited on perovskite leading to an order of magnitude slower mobility. To our knowledge, it is the highest-performance solar cell device (including dye-sensitized solar cells and organic photovoltaics) ever reported that is incorporated with porphyrin materials.   



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