High Power Density from Extremely Thin Solar Panels

by Allison Kerley

Bernardi et al. (2013) investigated the absorbance of graphene and three different monolayer transition metal dichalcogenides (TMDs)—MoS2, MoSe2, and WS2—alone and in various combinations as the active layer in ultrathin photovoltaic (PV) devices. In calculating the upper limits of the electrical current density (measured in mA/cm2), each material can contribute to the total absorption of a device. The authors found that subnanometer thick graphene and TMD monolayers can absorb the equivalent short-circuit currents of 2–4.25 mA/cm2, while 1 nm thick Si, GaAs, and P3HT (commonly used materials in current PV devices) were found to generate currents between 0.1–0.3 mA/cm2. Further testing suggested that the high absorption of the monolayer MoS2 is due Continue reading