Proceedings of Asia-Pacific Conference on Perovskite, Organic Photovoltaics&Optoelectronics (IPEROP25)
Publication date: 17th October 2024
Perovskite solar cells (PSC) have garnered attention as next-generation solar cells due to their ability to be manufactured via solution coating and low-temperature processes, achieving a photoelectric conversion efficiency exceeding 26%. Furthermore, research and development efforts for scaling up and modularization are actively underway for practical applications.
Typically, the electrical characteristics of solar cells are evaluated based on I-V measurements specified in IEC60904-1. However, PSCs face challenges in accurately determining steady-state output using I-V measurements alone due to their electrical properties being affected by factors such as delayed current response to voltage application and light exposure history.
As a result, research institutions measure the steady-state output and conversion efficiency of PSCs more accurately using methods such as MPPT (Maximum Power Point Tracking), Dynamic I-V (including Asymptotic I-V), and SPO (Stabilized Power Output) .
KISTEC has been focusing on research and development of the MPPT method[1]. The conventional MPPT method is the hill-climbing method, which uses fixed intervals for voltage changes. However, due to the slow current response of PSCs to applied voltage, the output can vary depending on measurement conditions (intervals).
To address this, KISTEC developed the Q-MPPT method, which enables stable measurements considering the unique characteristics of PSCs. The Q-MPPT method, Dynamic I-V method, and SPO were found to produce consistent results in single-cell measurements. However, when the Q-MPPT method was applied to perovskite modules, oscillations occurred, making it difficult to measure accurate steady-state output.
Given this situation, KISTEC developed the LS-MPPT method, incorporating the least squares method to determine steady states. It was found that this LS-MPPT method allows for steady-state output measurement in PSCs, where electrical properties vary due to various factors.
In the presentation, the algorithms of each MPPT method will be explained, and the results of applying these methods to PSC single cells and PSC modules manufactured by Sekisui Chemical Co., Ltd. will be reported.
Entrusted by NEDO, Japan
We would like to express our gratitude to Sekisui Chemical Co., Ltd. for the PSC samples.
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