Hybrid solar cell based on a-Si/polymer flat heterojunction on flexible substrates

In this work, we present the results of investigation of thin film hybrid organic-inorganic photovoltaic structures based on flat heterojunction hydrogenated silicon (a-Si:H) and poly(3,4 ethylene dioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) fabricated on polyethylene naphthalate (PEN). Different thicknesses of transparent AL doped Zn:O (AZO) electrodes have been tested on PEN substrate and studied by atomic force microscopy (AFM). The AZO films on PEN substrate were statistically processed to obtain surface morphological characteristics, such as root mean square roughness R_Q, skewness S_K and kurtosis K_U. Performance characteristics of fabricated photovoltaic structures have been measured and analyzed for different thicknesses of the transparent electrodes under standard illumination (AM 1.5 I₀= 100mW/cm²). Structures on flexible substrates show reproducible performance characteristic as their glass substrate counterpart with values of J_SC= 6 mA/cm₂, V_OC= 0.535 V, FF= 43 % and PCE= 1.41%.