Low-cost fabrication of compact TiO2 layer for efficient lead-halide perovskite solar cells

Sungjun Hong^a, Chi-Hwan Han^a, Ahreum Han^a, Kwan-Woo Ko^a, Moon-Hee Han^b, Eun Chong Lee^b

^aKoera Institute of Energy Research, 152 Gajeong-ro, Yuseong-Gu, Deajeon, 305-343, Korea, Republic of

^bGraduate School of Energy and Technology,Chungnam National University, 99, Daehak-ro, Yuseong-Gu, Deajeon, 306-764, Korea, Republic of

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, Sungjun Hong, 025
Publication date: 5th February 2015

A uniform and compact hole blocking layer is necessary for high efficient perovskite-based thin film solar cell. In this study, we fabricated TiO₂ compact layers by using a simple dip-coating method in contrast to the widely used techniques such as spin coating and spray pyrolysis. In this study, we optimized the surface morphologies of dip-coating based TiO₂ compact layers by controlling the concentration of Ti precursor solution diluted in ethanol. The analyses of devices performance characteristics showed that thickness and surface morphologies of different TiO₂ compact layers played a critical role in affecting the efficiencies. While the spin-coating based TiO₂ compact layer exhibited uncontrolled formation of nano-meter sized pinholes resulting in widely distributed PEC values of the corresponding solar cells, the TiO₂ compact layer fabricated by the dip-coating method led to significantly improved device performance partly owing to uniform and pinhole-free surface. Hence, the dip-coating route to prepare TiO₂ compact layers employed in this study is more amenable to fabricate the large area device and less expensive.

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International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

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