光谱失配对具有光子能量可调封装材料的硅异质结太阳能组件标准测量和户外实地测试的影响

Abstract Silicon heterojunction (HJT) photovoltaic module is sensitive to UV irradiation, which makes UV-down shifting films and UV-cutoff films widely used during module encapsulation. However, this method leads to significant variations in Spectral Responsivity (SR) within the UV spectrum band. To evaluate the difference of the two different encapsulants, the modules encapsulated with UV-downshifting and UV-cutoff technologies were prepared from identical cells and subjected to controlled outdoor field testing. A deviation in power output was detected in the UV-downshifting modules. In response, solar simulator filters were modified to generate spectra with varying UV intensities, and the SR of both module types was subsequently analyzed. The spectral mismatch encountered during Standard Test Conditions (STC) power testing was theoretically calculated and experimentally confirmed, showing a maximum deviation of 1.15%. By maintaining consistent encapsulation films for both reference modules and tested modules, spectral mismatch during testing can be effectively mitigated. After correcting the STC power of the UV-downshifting module, a specific yield (SY) gain of 0.51% was achieved for the UV-downshifting module compared to the UV-cutoff module during outdoor testing. This study provides empirical evidence on the performance of UV-downshifting and UV-cutoff modules in outdoor conditions, and addresses spectral mismatch challenges between the STC measurement and outdoor application.