The transparent photovoltaic cell (TPC) is an invisible solar cell by passing the visible range light while absorbing harmful UV light to generate electric power. Different from the conventional opaque colors or shapes of solar cells, TPC is transparent to human eyes and which would serve as an invisible power source for the window frames of mobile electronics, displays, and buildings. To fabricate the TPC, two different metal-oxide species are employed to make a transparent heterojunction. TiO₂ is the n-type semiconductor and serves as the UV light absorber. Above TiO₂ layer, p-type NiO is deposited for a high transmittance (>57%) for the visible light. The TPC is very sensitive to UV signals and thus, TPC can be a high-performing photodetector by self-powered operation due to the photovoltaic effect. The n-TiO₂/p-NiO photodetector shows high responsivity (0.23 A W⁻¹), detectivity (1.6 × 10¹⁰), and fast response time (4.1 ms). The power conversion efficiency of TPC is reached to 2.1% with high open circuit voltage (>0.5 V). A practical demonstration is performed to move a motor (0.2 V and 10 mA), powered by TPC. This clearly suggests the transparent solar cell as the invisible power generator.

透明光伏电池（TPC）是一种不可见的太阳能电池，通过使可见范围的光通过，同时吸收有害的紫外线以产生电能。与传统的不透明颜色或形状的太阳能电池不同，TPC对人眼透明，可作为移动电子设备，显示器和建筑物的窗框的不可见电源。为了制造TPC，采用了两种不同的金属氧化物来制造透明异质结。TiO ₂是n型半导体，并且用作UV光吸收剂。TiO ₂以上在第二层中，沉积p型NiO可获得可见光的高透射率（> 57％）。TPC对紫外线信号非常敏感，因此，由于光伏效应，TPC可以通过自供电操作成为高性能的光电探测器。n-TiO ₂ / p-NiO光电探测器显示出高响应度（0.23 A W ^-1），检测率（1.6×10 ¹⁰）和快速响应时间（4.1 ms）。在高开路电压（> 0.5 V）下，TPC的功率转换效率达到2.1％。进行了实际演示，以移动由TPC供电的电机（0.2 V和10 mA）。这清楚地表明透明太阳能电池是不可见的发电机。