Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
DOI: https://doi.org/10.29363/nanoge.iperop.2024.010
Publication date: 18th October 2023
Perovskite solar cells (PSCs) are expected to be one of the next-generation photovoltaics. Many companies around the world are competing to put PSCs into practical use. However, considerable difficulties in the reliable measurement of power generation of PSCs are a severe concern for fair and accurate evaluation in PSC developments. These difficulties are regarded to result from a slow current response to the applied voltage and metastability of PSCs. The metastability of the PSCs could mostly be related to changes in the electrical properties (ion migration) in the cells by exposure history (voltage bias, irradiance, time, and temperature) [1]. In the case of PSCs, reproducible I-V curve measurements might be difficult because the cells' electrical properties change during the measurements.
Steady-state measurements of the maximum power may be better than the I-V curve measurements defined in IEC 60904-1 for such metastable photovoltaics. Saito et al. [2] have reported that excellent consistency existed between the steady-state maximum powers obtained by the Maximum Power Point Tracking method (MPPT), steady-state (or stabilized) power output (SPO), and dynamic I-V measurements. In this study, changes in the electrical properties with exposure history will be discussed by using the MPPT method in order to predict the power generation of PSCs for practical use.
We have conducted a round-robin test of PSC with several institutions, AIST, JET, NREL, JRC, Fraunhofer, and CSIRO. In the round-robin test, each institution measured the maximum power in its own way. Based on those results, we plan to discuss standardization for PSC measurement at IEC-TC82 meeting. In our presentation, we will introduce the result of the round-robin test and our efforts to standardize PSC.
This study was entrusted by Ministry of Economy, Trade and Industry (METI) of Japan and New Energy Industrial Technology Development Organization (NEDO).
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