Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
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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