Epitaxially Grown One-Dimensional Electron Transport Layer Achieving High Performance Perovskite Solar Cells

Hyun Suk Jung^a, Byeong Jo Kim^a, Gill Sang Han^a

^aSungkyunkwan University, South Korea, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, 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, Hyun Suk Jung, 011
Publication date: 5th February 2015

Perovskite solar cells have generated a strong interest that it has higher absorption coefficient and long absorption wavelength. [1] Perovskite solar cells have achieved energy conversion efficiency of 19.3% using a CH₃NH₃PbI₃ absorber with mesoporous metal oxide nanoparticles (TiO₂). [2] CH₃NH₃PbI₃ solar cells should contain mesoporous metal oxide nanoparticle layers to collect the photogenerated electrons in perovskite layers due to their relatively short electron diffusion length, i.e. approximately 90nm. [3] 1-D nanostructured metal oxides have been under active research because of their distinguished charge collection property. [4] In the pesent study, we fabricated 1-D nanostructred tin oxide (SnO₂) nanowire arrays by using a vapor transport method (VTM). [5] The 1D array-based electron transport layer (ETL) is comprised of 1-D SnO₂ nanowires (NWs) array grown on FTO transparent conducting oxide substrate, and TiO₂ nanoshells grown epitaxially on the surface of the 1D SnO₂ NWs. Optimized devices showed ~100% of internal quantum yield at ~750nm of wavelength, and 14.2% of power conversion efficiency (PCE). To the bestof our knowledge, this is so far the highest PCE for 1D array based perovskite solar cells. The high quantum yield is attributed to one order faster electron tranport in the epitaxial TiO₂ layer, compared to conventional nanoparticle based meso porous TiO₂ layer. The high PCE, compared to other 1D-ETL based perovsktie solar cells, is attributed to thin SnO₂ NWs (~20nm) which is sufficiently thin to yield a large space to light absorbing perovskite material. In addition, the open space increases chance of making uniform TiO₂/perovksite junction, leading to more reproducible device performances, compared to the mp-TiO₂ which suffers from closed pores. This work can offer a way for abchieving reproducible, high efficiency perovskite solar cells.

[1] Hui-Seon Kim, Chang-Ryul Lee, Jeong-Hyeok Im, Ki-Beom Lee, Thomas Moehl, Arianna Marchioro, Soo-Jin Moon, Robin Humphry-Baker, Jun-Ho Yum, Jacques E. Moser, Michael Grätzel& Nam-Gyu Park, Scientific reports 2012, 2, 591 [2] H. Zhou, Q. Chen, G. Li, S. Luo, T.-B. Song, H.-S. Duan, Z. Hong, J. You, Y. Liu, Y. Yang, Science, 2014, 345, 542. [3] Guichuan Xing, Nripan Mathews, Shuangyong Sun, Swee Sien Lim, Yeng Ming Lam, Michael Grätzel, Subodh Mhaisalkar, TzeChien Sum, Science 2013, 342 [4] Hui-Seon Kim, Jin-Wook Lee, Natalia Yantara, Pablo P. Boix, Sneha A. Kulkarni, Subodh Mhaisalkar, Michael Grätzel and Nam-Gyu Park, Nano letters 2013, 13, 6 [5] Jun Hong Noh, Hyun Soo Han, Sangwook Lee, Jin Young Kim, Kug Sun Hong, Gil-Sang Han, Hyunjung Shin, Hyun Suk Jung, Advanced Energy Materials 2011, 1, 5

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