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Hierarchical Transparent Back Contacts for Bifacial CdTe PV
B Edward Sartor1,2, Teng Zhang3, Christopher P Muzzillo2
1New York University, Brooklyn, New York 11201, United States.
Abstract:
A hierarchical transparent back contact leveraging an AlGaO passivating layer, Ti3C2T MXene with a high work function, and a transparent cracked film lithography (CFL) templated nanogrid is demonstrated on copper-free cadmium telluride (CdTe) devices. AlGaO improves device open-circuit voltage but reduces the fill factor when using a CFL-templated metal contact. Including a Ti3C2T interlayer improves the fill factor, lowers detrimental Schottky barriers, and enables metallization with CFL by providing transverse conduction into the nanogrid. The bifacial performance of an AlGaO/Ti3C2T/CFL gold contact is evaluated, reaching 19.5% frontside efficiency and 2.8% backside efficiency under 1-sun illumination for a copper-free, group-V doped CdTe device. Under dual illumination, device power generation reached 200 W/m2 with 0.1 sun backside illumination.
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