Electrical Potential Distribution for High Performance Perovskite Solar Cells
Molang Cai a, Ishida Nobuyuki b, Liyuan Han a, Takeshi Noda a
a National Institute for Materials Science (NIMS), Center for Green Research on Energy and Environmental Materials, Photovoltaic Materials Group, Japan, Japan
b 2Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Kitakyūshū-shi, Japan, 2018 January 28th - 30th
Organizers: Shuzi Hayase, Juan Bisquert and Hiroshi Segawa
Poster, Molang Cai, 087
Publication date: 27th October 2017

Electrical Potential Distribution for High Performance Perovskite Solar Cells

Molang Cai1, Ishida Nobuyuki2, Liyuan Han1*, Takeshi Noda1*

1Photovoltaic Materials Group, Center for Green Research on Energy and Environmental Materials, Japan

2Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, Japan

CAI.molang@nims.go.jp

Perovskite solar cells (PSCs) have attracted great research interest owing to their advantages in high power conversion efficiency, low-cost fabrication with earth-abundant materials. Once the impressively high efficiency in PSCs was achieved, attention must shift to understanding the fundamental mechanism including the charge carrier separation, extraction, transport, recombination, and the electronic potential distribution affecting these carrier dynamics and the power conversion efficiency. The electric potential distribution is affected by the electrical properties of materials, including charge transport ability, doping concentration, band alignment between layers as well as surface contacts. It is of great importance to clarify the electric field distribution within the perovskite solar cells for a deeper understanding and further enhancement of the efficiency to 25% or higher values.

In this study, we profiled the electric potential distribution within mesoporous structured and planar structured PSCs. Therefore, elucidation of the electronic potential distribution that correlates with the cell performance in PSCs. According to our finding on electric potential distribution that affect the charge dynamics and the device performance, we did further optimization of the devices by changing the content of perovskite film and obtained outstanding efficiencies beyond 20% based on both structures.

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