Vacuum‐Deposited Transparent Organic Photovoltaics for Efficiently Harvesting Selective Ultraviolet and Near‐Infrared Solar Energy

Highly transparent photovoltaics (TPVs) integrated to a battery with small capacity can efficiently drive low‐powered internet of things (IoT) devices such as the receivers, sensors, actuators, etc. Such see‐through solar technology not only provides an opportunity to convert ambient light (sunlight or indoor lighting) to electricity but also demonstrates a concept of self‐sustainable power. In this work, a selective ultraviolet/near‐infrared bulk‐heterojunction active layer, i.e., chloroaluminum phthalocyanine (ClAlPc) as donor and C₆₀ as acceptor with a Cu:Ag/WO3 transparent electrode to visible lights are combined for achieving the vacuum‐deposited TPVs with a power conversion efficiency of 1.34%, average visible transmission of 77.45%, and color rendering index of 91.9. Moreover, a TPV module with a working area of 1.5 cm² is able to charge a 0.58 mAh LiFePO4(LFP)//Li battery fully within one hour under 100 mW cm^‐2 (≈1 sun) illumination. The TPV module can drive an exciplex organic light‐emitting diode with the electroluminescence >180 cd m⁻² at low illumination intensity of <5 mW cm^‐2. Overall, this work presents a significant step forward in the development of TPV technology towards integrating a display and storage battery, which could be successfully applied in wearable electronics requiring invisible and sustainable solar power.