Efficient and stable Perovskite Solar Cells and Modules
Liyuan Han a
a National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 3050047, 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
Invited Speaker, Liyuan Han, presentation 136
Publication date: 7th November 2016

Perovskite solar cell (PSC) unprecedentedly developed in recent years due to its excellent photovoltaic performance and simple solution processing method. This time I will introduce our main achievements obtained from inverted PSC devices with cell size over one centimetre square. Firstly, reproducibility of device performance was improved through controlling the morphology and uniformity of perovskite layer and charge extraction layers in the solar cells. The thick charge extraction layerswith high conductivity, such as NiO and TiO2 heavily doped with Mg2+, Li+ and Nb5+, were usedto reduce pinhole of the film and increase the long-term stability of device. Secondly, we developed efficient inverted-structure with a perovskite-fullerene graded heterojunction (GHJ), which is featured with a gradient distribution of electron accepting material in the light absorption perovskite layer. This structure is found capable of enhancing the PCE of inverted structured PSCs as it improves the photoelectron collection and reduces recombination loss, especially for the formamidinium (FA) cation based perovskites that have superior spectra response and thermal stability. The conformal fullerene coating on perovskite during the GHJ deposition facilitates a full coverage of fullerene with reduced layer thickness, thus minimize the resistive loss in larger size devices. Though these efforts, we have successfully achieved certified efficiency of 19.2% based on a cell with an aperture area larger than one centimetre square. Furthermore, The design of the modules and the cost analysis of PSCs module were also introduced. Ii is possible to achieve the  module cost lower that of silicon solar cells in case of the module with efficiency > 15% and lifetime >15 years.

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