Cojocaru Ludmila, Uchida Satoshi, Tamaki Koichi, Jayaweera Piyankarage V V, Kaneko Shoji, Nakazaki Jotaro, Kubo Takaya, Segawa Hiroshi
Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan.
Komaba Organization for Educational Excellence, Faculty of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo, 153-8902, Japan.
Sci Rep. 2017 Sep 18;7(1):11790. doi: 10.1038/s41598-017-10953-3.
Energy harvesting at low light intensities has recently attracted a great deal of attention of perovskite solar cells (PSCs) which are regarded as promising candidate for indoor application. Anomalous hysteresis of the PSCs a complex issue for reliable evaluation of the cell performance. In order to address these challenges, we constructed two new evaluation methods to determinate the power conversion efficiencies (PCEs) of PSCs. The first setup is a solar simulator based on light emitting diodes (LEDs) allowing evaluation of the solar cells at wider range of light intensities, ranging from 10 to 10 mW·cm. As the overestimate error, we found that the PCEs of dye sensitized solar cell (DSC) and PSCs increase dramatically at low light intensities conditions. Due to the internal capacitance at the interfaces on hybrid solar cells, the measurement of current below 10 mW·cm shows constant value given high PCE, which is related to the capacitive current and origin of the hysteresis. The second setup is a photovoltaic power analyzing system, designed for tracking the maximum power (P ) with time. The paper suggests the combination of the LED solar simulator and P tracking technique as a standard to evaluate the PCE of capacitive solar cells.
低光强下的能量收集最近引起了钙钛矿太阳能电池（PSC）的广泛关注，钙钛矿太阳能电池被视为室内应用的有前途的候选者。PSC的异常滞后现象是可靠评估电池性能的一个复杂问题。为了应对这些挑战，我们构建了两种新的评估方法来测定PSC的功率转换效率（PCE）。第一种装置是基于发光二极管（LED）的太阳能模拟器，可在10至10 mW·cm的更宽光强范围内评估太阳能电池。作为高估误差，我们发现在低光强条件下，染料敏化太阳能电池（DSC）和PSC的PCE会急剧增加。由于混合太阳能电池界面处的内部电容，在10 mW·cm以下测量电流时，在高PCE情况下显示恒定值，这与电容性电流和滞后现象的起源有关。第二种装置是光伏功率分析系统，设计用于随时间跟踪最大功率（P）。本文建议将LED太阳能模拟器和P跟踪技术相结合，作为评估电容性太阳能电池PCE的标准。
