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Precise performance characterization of perovskite solar cells
Yoshihiro Hishikawa,Haruya Shimura,Takashi Ueda,Ayumi Sasaki,Yuki Ishii 한국물리학회 2016 Current Applied Physics Vol.16 No.8
Experimental procedure for precisely characterizing the performance of perovskite solar cells such as the current-voltage (I-V) curves and the maximum output power Pmax is investigated, based on results of the samples with different structures. Special care is taken for the hysteresis effects. Confirming the hysteresis of the I-V curves in a wide range including the timescale of minutes is preferred for precise measurements, since the hysteresis remains for more than 10 min in some samples. When the hysteresis is persistent even for a long sweep time, the stable Pmax can be determined by examining the temporal trend of the output current by fixing the bias voltage at near Vpm after forward and reverse bias histories.
Yuhei Horio,Mijanur Rahman,Yurei Imai,Yoshihiro Hishikawa,Takashi Minemoto 한국물리학회 2017 Current Applied Physics Vol.17 No.10
The output energy of photovoltaic (PV) modules is influenced by the spectral irradiance distribution of the solar spectrum under outdoor conditions. To rate the precise output energy of PV modules, the correction of short circuit current (ISC) based on actual environmental conditions is needed, because ISC significantly depends on the shape of the spectral irradiance distribution. The average photon energy (APE) is a zero-dimensional index for spectral irradiance distribution, and APE value uniquely describes the shape of a solar spectrum. Thus, APE has an impact on ISC of PV modules. In this contribution, the relationship between APE coefficient and ISC of the multi-crystalline silicon, single-crystalline silicon, heterojunction intrinsic thin-layer, back contact, copper indium selenide and cadmium telluride PV modules has explored. It is revealed that APE value changes the ISC of PV modules which appeared to have immense possibilities of ISC correction using APE coefficient. This new approach can be very effective for precise rating the output energy of PV modules under actual outdoor conditions.
Takeguchi Kota,Chantana Jakapan,Nakayama Koichi,Kawano Yu,Nishimura Takahito,Hishikawa Yoshihiro,Minemoto Takashi 한국물리학회 2021 Current Applied Physics Vol.28 No.-
Spectral mismatch correction factor (MM) is determined by average photon energy (APE). APE based on wide solar spectral ranges leads to better description of solar spectral shape. Moreover, error between corrected outdoor short-circuit current (ISC) of PV module and its ISC under standard test conditions is investigated using PV module irradiance sensor (PVMS) and/or MM, where PVMS is a single-crystalline silicon PV module. The error of muti-crystalline silicon (mc-Si) PV module is as low as about 1% regardless of the use of MM attributed to small spectral mismatch between PVMS and mc-Si PV module. On the other hand, the low error of CdTe test PV module is obtained under the use of both PVMS and MM caused by the high spectral mismatch between PVMS and CdTe test PV module. The error is further decreased, when MM is estimated from the APE based on wide ranges of the solar spectrum.