Abstract
Thin-film hybrid organic-inorganic photovoltaic structures based on hydrogenated silicon (Si:H), poly(3,4ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) polymer Al-doped ZnO (AZO) films deposited on different types of flexible substrates have been fabricated and investigated. The compatibility of the polymer and inorganic materials regimes and deposition techniques used for device fabrication has been demonstrated on flexible substrates. Morphological characteristics of transparent Al-doped ZnO (AZO) films deposited on substrates have been measured by atomic force microscopy. Electronic characteristics of the fabricated photovoltaic structures have been measured and analyzed for different thicknesses of the transparent electrodes and different substrate types. Photovoltaic hybrid structure on polyethylene naphthalate (PEN) substrate showed the best characteristics: short circuit current density Jsc = 9.79 mA/cm2, open circuit voltage Uoc = 565 mV, and PCE η = 1.3%. To analyze the mechanisms governing the device performance, short circuit current density spectral dependence of the devices fabricated on different types of flexible substrates has been measured. As demonstrated by our analysis, the structures on PEN substrates, besides better substrate transmittance, also show better junction properties.
Highlights
Photovoltaic (PV) structures on lightweight and flexible substrates have several advantages over the heavy glass-based structures in both terrestrial and space applications [1,2]
Solution-processed organic solar cells offer the attractive feature of providing low-cost, high-efficiency, flexible, and large-area photovoltaic devices through cheap roll-to-roll fabrication at a low processing temperature [6]
That the properties of interfaces in such multilayer structure are of great importance and, for the analysis of the photovoltaic performance the reliable data are needed
Summary
Photovoltaic (PV) structures on lightweight and flexible substrates have several advantages over the heavy glass-based structures in both terrestrial and space applications [1,2]. The specific power of the solar cells is an important factor in space applications and the development of photovoltaic devices on light-weight substrates is interesting. Third generation organic photovoltaics, which include devices with flat and bulk heterojunction between the various types of conjugated polymers, small molecules, fullerene derivatives, and carbon nanotubes, continue to attract great attention from the scientific community [3,4,5]. Solution-processed organic solar cells offer the attractive feature of providing low-cost, high-efficiency, flexible, and large-area photovoltaic devices through cheap roll-to-roll fabrication at a low processing temperature [6]. As a result of impressive efforts in developing novel low bandgap polymer donor materials, optimizing the photoactive layer morphology, interface engineering, and novel light-trapping
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