NOVELTY - The method (200) involves forming an absorber layer above a substrate of a photovoltaic device (204). A buffer layer is formed (206) over the absorber layer. The photovoltaic device is pre-heated (208) at heating rate to selected temperature, where the heating rate is higher than 5 degree Celsius per minute. A front contact layer is formed (210) over the buffer layer at the selected temperature after pre-heating the photovoltaic device, where the selected temperature is in range of from 150 degree Celsius to 200 degree Celsius.    USE - Method for fabricating a photovoltaic device i.e. thin film solar cell.    ADVANTAGE - The method enables utilizing intrinsic zinc oxide with high electrical resistance to mitigate shunt current and reduce formation of shunt paths in the photovoltaic device. The method enables utilizing high electrical conductivity and high optical transmittance of a transparent conductive layer to improve photovoltaic efficiency of the photovoltaic device. The method enables utilizing higher heating rate or lower thermal budget to provide the absorber layer and a junction with significantly better quality so as to significantly increase quantum efficiency (QE), module power and irradiation performance of the photovoltaic device.    DETAILED DESCRIPTION - The heating rate is in range from 8 degree Celsius per minute to 11 degree Celsius per minute and 5 degree Celsius per minute to 25 degree Celsius per minute. The front contact layer is formed by using boron-containing precursor that comprises diborane.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating a method for fabricating a photovoltaic device.    Method for fabricating photovoltaic device (200)    Step for forming absorber layer above substrate of photovoltaic device (204)    Step for forming buffer layer over absorber layer (206)    Step for pre-heating photovoltaic device at heating rate to selected temperature (208)    Step for forming front contact layer over buffer layer at selected temperature after pre-heating photovoltaic device (210)