|Title||Combined effect of double antireflection coating and reversible molecular doping on performance of few-layer graphene/n-silicon Schottky barrier solar cells|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2016|
|Authors||Lancellotti, L., Bobeico E., Capasso A., Lago E., P. Veneri Delli, Leoni Enrico, Buonocore F., and Lisi N.|
|Keywords||Antireflection coatings, Beneficial effects, carbon, Chemical vapor deposition, coating, Coatings, Conversion efficiency, Crystalline silicon wafers, Deposition, Device performance, Efficiency, electrical conductivity, electronic equipment, energy efficiency, External quantum efficiency, Few-layer graphene, film, fuel cell, Graphene, Graphene devices, Infrared devices, Nitric acid, Optical properties, performance assessment, Power conversion efficiencies, Schottky barrier diodes, Schottky junctions, Semiconductor doping, Semiconductor junctions, Silicon solar cells, Silicon wafers, Solar cells, solar power, Vapor deposition, Visible and near infrared|
Few-layer graphene films were grown by chemical vapor deposition and transferred onto n-type crystalline silicon wafers to fabricate graphene/n-silicon Schottky barrier solar cells. In order to increase the power conversion efficiency of such cells the graphene films were doped with nitric acid vapor and an antireflection treatment was implemented to reduce the sunlight reflection on the top of the device. The doping process increased the work function of the graphene film and had a beneficial effect on its conductivity. The deposition of a double antireflection coating led to an external quantum efficiency up to 90% across the visible and near infrared region, the highest ever reported for this type of devices. The combined effect of graphene doping and antireflection treatment allowed to reach a power conversion efficiency of 8.5% exceeding the pristine (undoped and uncoated) device performance by a factor of 4. The optical properties of the antireflection coating were found to be not affected by the exposure to nitric acid vapor and to remain stable over time. © 2016 Elsevier Ltd.
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