Abstract
Molybdenum oxide (MoO3) is one of most suitable antireflection (AR) layers for silicon/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (Si/PEDOT:PSS) hybrid solar cells due to its well-matched refractive index (2.1). A simulation model was employed to predict the optical characteristics of Si/PEDOT:PSS hybrid solar cells with the MoO3 layers as antireflection coatings (ARCs), as well as to analyze the loss in current density. By adding an optimum thickness of a 34-nm-thick ARC of MoO3 on the front side and an effective rear back surface field (BSF) of phosphorus-diffused N+ layer at the rear side, the hybrid cells displayed higher light response in the visible and near infrared regions, boosting a short-circuit current density (Jsc) up to 28.7 mA/cm2. The average power conversion efficiency (PCE) of the Si/PEDOT:PSS hybrid solar cells was thus increased up to 11.90 %, greater than the value of 9.23 % for the reference devices.
Highlights
Organic/inorganic hybrid solar cells that combine the advantages of crystalline silicon (c-Si) and organic solar cells have attracted much attention in recent years owing to their solution-based treatment, simplified processing, and routinely increased power conversion efficiency (PCE) [1,2,3]
Special designs are needed at the rear side of the hybrid solar cells in order to efficiently collect the photo-generated carriers related to the incident light with a longer wavelength
The photocurrent density (Jph), total current density (Jtot), total loss percentage (Ploss), loss current density (Jloss), reflection loss (R), and parasitic absorption loss were calculated by integrating the absorption and reflection spectrum of the solar cell [15, 32]
Summary
Organic/inorganic hybrid solar cells that combine the advantages of crystalline silicon (c-Si) and organic solar cells have attracted much attention in recent years owing to their solution-based treatment, simplified processing, and routinely increased power conversion efficiency (PCE) [1,2,3]. PEDOT:PSS is amenable to solution-based processes and shows good conductivities of up to 1000 S/cm, suitable work functions in the range of 4.8–5.2 eV, and high transparency in a visible light range [8,9,10,11]. All of these advantages enable silicon/ poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (Si/PEDOT:PSS) hybrid solar cells to achieve a PCE. Limited by the quite lower reflective index (1.2–1.6) for the PEDOT:PSS layer, it is critical to precisely figure out appropriate materials and optimum thickness of the AR layer. Special designs are needed at the rear side of the hybrid solar cells in order to efficiently collect the photo-generated carriers related to the incident light with a longer wavelength
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