科研之友
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摘要
Microcavity-based semitransparent organic solar cells (ST-OSCs) have become a hot issue in the research field of green energy harvesting due to their wider potential applications in colored photovoltaic glass, buildingintegrated photovoltaics, and so on. However, for this kind of ST-OSCs, high photoelectric conversion efficiency (PCE) and high peak transmittance cannot usually be achieved simultaneously. To circumvent the problem, this paper proposes MgF2 microcavity with a structure of Au/Ag/MgF2/Ag for ST-OSCs so that high peak transmittance can be achieved at low cost of PCE. The device structure of ST-OSCs is Glass/ITO/ZnO/PTB7Th: IEICO-4F/MoO3/Au/Ag/MgF2/Ag. By combining the high transmittance of MgF2 microcavities with the low absorption of IEICO-4F in the blue light, a colorful ST-OSCs with high blue light transmittance can be obtained. The IEICO-4F in the active layer shows strong optical absorption in the near-infrared wavelength region, but weak absorption in the visible region. The results demonstrate that the peak transmittance of ST-OSCs reached a high value of 48% at 440 nm and the PCE reached 10.4%. Such a high peak transmittance is achieved while the PCE reduction compared to the control opaque device is about 5%. The PCE loss rate at each peak transmittance is the lowest among the reported values for the similar ST-OSCs devices. By adjusting the thickness of MgF2, STOSCs with different colors can be obtained, the peak transmittance of which is over 32% and the PCE loss rate is less than 7.25%. This report provides a new approach to solve the trade-off between efficiency and transmittance of ST-OSCs.
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单位华南农业大学
