Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Publication date: 14th October 2019
Perovskite solar cells (PSCs), invented by Miyasaka et al., have features such as simple manufacturing processes, low cost, flexibility, and high power conversion efficiency, and are being studied all over the world. However, some PSCs have very large hysteresis and cannot be evaluated accurately by conventional I-V measurements defined in the IEC standards. Our institute, KISTEC, is researching not only conventional I-V measurement methods, but also multiple evaluation methods with high accuracy and reproducibility. Firstly, stabilized current at fixed voltage (SCFV) method has been investigated. In this method the stabilized current at the voltage fixed near the maximum power point was measured and the output power was calculated. Secondly, dynamic I-V method, which enables current stabilization at each voltage step automatically has been studied. The third method is the Maximum Power Point Tracking (MPPT) method, which has recently been adopted by many research institutes. MPPT is a method of changing the voltage in small increments so that the maximum output can always be obtained, and it is already adopted method for modules at outdoors. However, in the case of a cell having a large hysteresis, even a small voltage change often causes oscillation or continuous decrease of the power. In this study we have focused especially on a new MPPT method which enables long-time measurements, and have developed a highly reproducible measurement protocol consisting of a unique algorithm that focuses on the sweep direction.
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) and Ministry of Economy, Trade and Industry (METI) of Japan.
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