Hybrid solar cells constructed of macroporous n-type GaP coated with PEDOT:PSS

Hybrid organic-inorganic solar cell devices were fabricated utilizing macroporous n-type GaP and poly(3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS). The high-aspect ratio structures of the macroporous GaP resulted in higher photocurrent and external quantum yield as a function of wavelength. Photocurrent-voltage measurements as a function of light intensity revealed information on the dependence of short-circuit current (Jsc) and open-circuit voltage (Voc) on light intensity. Under 1.0 Sun illumination, hybrid macroporous GaP/PEDOT:PSS devices showed Jsc of 2.34 mA cm-2, Voc of 0.95 V, fill factor of 0.54, and overall efficiency of 1.21%. The extent of the influence of dopant density of GaP on hybrid device performance was probed with current density-voltage measurements. The addition of a gold nanoparticle coating on macroporous GaP prior to PEDOT:PSS coating showed increased device performance, with overall efficiency of 1.81%. Gold-modified planar GaP/PEDOT:PSS showed decreased Jsc and Voc values and lower external quantum yield over all wavelengths.