Electrical characterization of inorganic-organic hybrid photovoltaic devices based on silicon-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)

Abstract

Hybrid organic-inorganic photovoltaic devices based on nanostructured silicon and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hybrid devices present excellent light harvesting capabilities as well as a simple fabrication process. Unlike the metal/Si junction, PEDOT:PSS solution can be solution-casted onto the silicon surface structure to build up hybrid photovoltaic devices without using vacuum deposition techniques. Detailed electronic characterization at PEDOT:PSS/Si heterojunctions is indispensable for achieving a high-performance device. In this paper, the electronic properties of current-voltage, capacitance-voltage, and internal quantum efficiency are characterized in order to explore the organic-inorganic heterojunctions properties. The interfacial defect state density (Dit) of hybrid organic-inorganic photovoltaic devices as well as majority carrier charge transfer velocity (vn) has been extracted from the electrical measurement results. It has been found that less Dit and lower vn can lead to improved electric output characteristics of the organic-inorganic heterojunctions photovoltaic devices, which is ascribed to suppressed charge recombination at the organic-inorganic interface.

Highly efficient poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/Si hybrid solar cells with imprinted nanopyramid structures

“…The calculated IQE spectra [ Figure 4(b)] showed enhancement from surface nanostructures but exclude any anti-reflective effect associated with the surface nanostructures. The discrepancy between this work and the previously reported literature 19 in the short wavelength range (300 nm-400 nm) of the IQE is probably due to the difference in the reflectance. The results from the IQE spectra indicated that the improvement in the EQE and J sc is attributed to the antireflective effect and higher carrier collection efficiency.…”

Effect of substrate bias on mist deposition of conjugated polymer on textured crystalline‐Si for efficient c‐Si/organic heterojunction solar cells

“…Most of studies on the film deposition of PEDOT:PSS has been performed using spin coating (SC) followed by thermal annealing to remove residual solvent. Promising efficiencies of 9–13% have already been reported with no use of p–n junction and transparent conductive oxide such as indium tin oxide (ITO) . For further higher efficiency, an enhanced internal light trapping approach such as textured c‐Si by wet etching, nanometer‐sized pillar, antireflection (AR) layer coating, and photonic crystal has been extensively studied .…”

Hybrid Photovoltaics – from Fundamentals towards Application

“…[259][260][261][262][263][264][265][266][267][268][269] Compared with the conventional fabrication process of crystalline Si solar cells these hybrid solar cells could be fabricated at significantly lower costs. Instead of the high-temperature diffusion or expensive implantation process to form a p-n junction, simply a polymer layer was added on top of a n-type Si wafer.…”