The study of co-sensitization of metal-free indoline dye (D149) and methylammonium lead bromide perovskite on mesoporous titania thin film
Ashish Kulkarni a, Tsutomu Miyasaka a, Peerathat Pinpithak a
a Toin university of Yokohama, 1614 Kurogane-cho, Aoba-ku, Yokohama, 225, Japan
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, Peerathat Pinpithak, 016
Publication date: 7th November 2016

Metal-free indoline dye (D149) is a promising organic molecular sensitizer for dye-sensitized solar cell (DSSC) due to its large-molar extinction coefficient and efficient electron injection properties on metal oxide semiconductor surface. However, charge recombination due to defect presence interface and/or self-aggregation among dye molecules is significantly suppress photovoltaic performance. Methylammonium lead bromide pervoskite (MAPbBr3) has been widely employed as light absorber owing to appropiated band gap (1.9-2.3 eV) and high Voc. Herein, we investigate co-sensitization between D149 and MAPbBr3. The perovkite solution in DMSO was deposited on D149 embedded mesoporous titania (as thickness ca. 400 nm) by spin-coating and employing spiro-OMeTAD as hole-transporting material (HTM). Bimolecular substrate shows intense broad absorption from 400 to 650 nm in which absorption of individual take place. After doping with a few content of MAPbBr3 , the synergistic effect can be obviously observed by showing high yield of IPCE spectrum covering from 300-600 nm and improving photo-conversion efficiency (increasing as 20% compared with pure dye) as well. Bimolecular system also demonstrates improving Jsc, Voc and FF. However, according to our knowledge, synergistic effect between bimolecules is supported by dopant infiltration and morphology of devices as well. Small concentration (approximately 0.2 M) of MAPbBr3 fully penetrates into TiO2 mesoporous structure without large voids or capping layer.

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