Porous Counter Electrode for Monolithic Dye-Sensitized Solar Cells Under Dim-light Applications
Yu-Chiung Lin a, Pei-Ying Lin a, Chao-Yu Chen a b c
a Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan, ROC.
b Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, 70101 Tainan, Taiwan, ROC
c Division Director of Education & Research Center for Micro/Nano Science and Technology (CMNST), National Cheng Kung University, Taiwan, Tainan, Taiwan, Republic of China
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Yu-Chiung Lin, 122
Publication date: 23rd October 2018

The general monolithic dye-sensitized solar cells (M-DSCs) constructed on a single conductive substrate with a triple-layer structure, comprising of a nanoporous working electrode layer, an insulating layer, and a porous counter electrode layer. Carbon is the most common counter electrode for M-DSCs application, which needs a thicker thickness for better electrical conductivity [1-3]. However, over-thick carbon restricts the carrier transportation so in this study we deposit Au metal on the substrate with thermal evaporation and anneal in the ambient environment to create porous structure as a p-type CE. The electrolyte Cu(II/I)(dmby)2TFSI2/1redox mediators in acetonitrile (ACN) solvent with Y123 organic dye. The lower dielectric constant SiO2 was introduced as the insulating layer to reduce the interface polarization and effectively separate electrons and holes [4-6]. We compare the devices performance for different particle sizes of commercial SiO2. In our result, the series resistance reduced as SiO2 layer thickness decreased in smaller particle size (IPA-ST-L, 40-50nm) case, in contrast, series resistance reduced as SiO2 layer thickness increased in larger particle size (IPA-ST-ZL, 70-100nm) case. By optimization the device achieved a PCE of 12.6% in the active area 1cm2 under the dim-light (200lux) condition.

The authors are grateful to the financial support from the Ministry of Science and Technology (MOST 107-2221-E-006-190-MY3 and MOST 107-2119-M-006-002).

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