Ultrathin Wide‐Bandgap a‐Si:H‐Based Solar Cells for Transparent Photovoltaic Applications
Alex J. Lopez‐Garcia, O. Blázquez, C. Voz, Joaquim Puigdollers, Víctor Izquierdo‐Roca, A. Pérez-Rodrı́guez
Abstract
Herein, the fabrication of UV‐blue selective transparent solar cells based on ultrathin (<30 nm) intrinsic hydrogenated amorphous silicon films (a‐Si:H) as absorber and using a fully inorganic architecture is reported, using metal‐oxide thin films as carrier selective contacts and as transparent electrical contacts. These transparent ultrathin devices present a photovoltaic effect and high average visible transmittance (AVT), showing their potential as candidates for implementation as a transparent energy harvester. Potential applications range from Building‐Integrated PV to agrophotovoltaics, and can also be of interest as a ubiquitous and inexpensive power source integrated in functional devices such as low‐power devices, Internet of Things devices, and other sensors. Glass/FTO/ZnO/a‐Si:H/MoO 3 /ITO device prototypes are produced. These devices present an AVT ranging from 50% to 69%, present a photovoltaic effect with a power conversion efficiency up to 0.5% calculated for an AM1.5G spectrum and have light utilization efficiency (LUE) values of 0.25%, confirming the potential of the proposed device architectures for the development of highly transparent devices with improved LUE.