Boosting the performance of back-contact perovskite solar cells by enlarging crystal size
Teng Ma a, Ayumi Hirano-Iwata a
a Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Oral, Teng Ma, presentation 044
Publication date: 14th October 2019

  Organometal halide perovskite materials have emerged as the strong candidates for the next generation photovoltaic materials. The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has reached 25.2%, which is the highest efficiency in thin-film photovoltaics.[1] To further boost the PCE of PSCs, we previously proposed that the replacing the widely-used sandwich structure with a new back-contact structure would lead to PSCs with higher efficiency, lower cost, and better compatibility for upscaling.[2] However, since the distance between two electrodes is longer in back-contact structure than that in the traditional sandwich structure, the performance of back-contact PSCs is significantly affected by the grain boundaries in the charge transporting path.

  Here, we report that the performance of back-contact PSCs can be boosted by forming high-quality perovskite films with large crystal size on the back-contact substrates. The results of photoluminescence microscopy explicitly demonstrate that the charge collecting efficiency is largely improved when the crystal size is close to or larger than the distance between two adjacent electrodes. I will discuss the film-formation method and the performance of the devices in the presentation.

This work is supported by JSPS KAKENHI Grant Number 18K14120 and Yazaki Memorial Foundation for Science and Technology.

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