Investigation of hysteresis in a high efficiency planar heterojunction perovskite solar cell

Takaya Kubo^a, Ludmila Cojocaru^a, Jotaro Nakazaki^a, Hiroshi Segawa^a, Satoshi Uchida^b, Victoria Gonzalez-Pedro^c, Juan Bisquert^c, Yoshitaka Sanehira^d

^aGraduate School of Engineering, Toin University of Yokohama, Kurogane-cho 1614, Aoba-ku, Yokohama, 225-8503

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, Ludmila Cojocaru, 176
Publication date: 5th February 2015

Organometal halide perovskites (CH₃NH₃PbI₃) have become a new attractive photovoltaic material due their remarkable optical, electronic proprieties and impressive power conversion efficiencies.[1,2] In the early stages, the perovskite solar cells were fabricated based on the classic mesoscopic dye sensitized solar cells, where perovskite worked as light absorber.[3] On the other hand, due to the ambipolar charge-conductivity of this material, it can also be adopted in more simple architecture, including planar p-n heterojunction solar cells.[4,5] In this presentation, we will show our recent results and progress in planar structure perovskite solar cells. First, we will discuss about the process of fabrication of efficient solar cells, showing effects of morphology and quality of perovskite layer, interfacial connection between compact TiO₂ layer and perovskite layer on the cell performance. The hysteresis is also observed in our perovskite cells, the efficiency in reverse scan is bigger than in forward scan (about 17% and 12%, for reverse and forward scans, respectively). Secondly, we will present our understanding about hysteresis phenomena in our devices, including results of I-V measurement taken at different temperatures, different light intensities, applied bias. Crystallographic analysis by X-ray diffraction and Raman spectroscopy at different temperature and light intensity will be also discussed.

1. Kojima A. ; Teshima K. ; Shirai Y. ; Miyasaka T. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cell, J. Am. Chem. Soc. 2009, 131, 6050-6061. 2.Supporting Information is also available electronically on the CSJ-Journal Web site, http://ww.csj.jp/journals/chem-lett/index.html F. 3. Burschka J; Pellet N; Moon S. J; Humphry-Baker R.; Gao P.; Nazeeruddin Md K.; Gratzel M. Sequential deposition as a route to high-performance perovskite-sensitized solar cells, Nature 2013, 499, 316-319. 4. Liu M.; Johnston M. B.; Snaith H. J. Efficient planar heterojunction perovskite solar cells by vapour deposition, Nature 2013, 501, 395-398. 5. Liu D.; Kelly T. L. Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques, Nature Photonics 2014, 8, 133-138.

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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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