Progress in Photovoltaics Research and Applications · 2003 · 300 citations · 15 references
EngineeringMaterials EngineeringMaterials ScienceElectronic MaterialsSemiconductor DevicesSemiconductor MaterialsChemical Vapor DepositionPhotovoltaic DevicesPhotovoltaic MaterialsSemiconductor Device MaterialsSemiconductor Thin FilmsSolar CellsAtomic DiffusionAtomic Diffusion Across InterfacesBand GapElectronic Band GapFill FactorPassivation LayersPhotovoltaic Thin FilmsTemperature Effects On Deposition
The study aims to optimize indium sulfide buffer layers for high‑efficiency CIGS thin‑film solar cells. This is achieved by depositing the layers via atomic layer chemical vapour deposition using separate pulses of indium acetylacetonate and hydrogen sulfide. Parametric studies show that a 30‑nm indium sulfide layer deposited at 220 °C yields a 16.4 % efficient CIGS cell with enhanced blue response, a 2.7–2.8 eV band gap, V_oc up to 665 mV, 78 % fill factor, high interface quality, and evidence of sodium and copper diffusion. © 2003 John Wiley & Sons, Ltd.
Abstract This paper presents optimization studies on the formation of indium sulfide buffer layers for high‐efficiency copper indium gallium diselenide (CIGS) thin‐film solar cells with atomic layer chemical vapour deposition (ALCVD) from separate pulses of indium acetylacetonate and hydrogen sulfide. A parametric study of the effect of deposition temperature between 160° and 260°C and thickness (15–30 nm) shows an optimal value at about 220°C for a layer thickness of 30 nm, leading to an efficiency of 16·4%. Analysis of the device shows that indium sulfide layers are characterised by an improvement of the blue response of the cells compared with a standard CdS‐processed cell, due to a high apparent band gap (2·7–2·8 eV), higher open‐circuit voltages (up to 665 mV) and fill factor (78%). This denotes high interface quality. Atomic diffusion processes of sodium and copper in the buffer layer are demonstrated. Copyright © 2003 John Wiley & Sons, Ltd.
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