The development of transition metal (Fe, Co, Ni, Mn) oxides based thin coatings is reported on stainless steel substrates for solar absorber applications. Absorber layers are synthesized using in-house developed spray system for metalmetal oxide composite coating structures. The optimized combinations of transition metal precursors are sprayed for thin film deposition. The post-spray heat treatment has been carried out to convert the transition metal precursor layers into spectrally selective absorber coatings showing metal-metal oxide composite structures. Three combinations of bi-transition metals Co-Mn, Co-Fe, and Co-Ni precursors are used to synthesize thin film structures. The thickness of these thin films structures is nearly 1 mu m. These spectrally selective coatings exhibit high absorptivity (alpha similar to 0.9) in 300-900 nm wavelength range and emissivity (epsilon similar to 0.18-0.44) in 2.5-25 mu m wavelength range. The extension of this work is focused on the development of a large-scale system, capable of fabricating spectrally selective coating on desired structures and optimization of annealing conditions, leading to the optimum solar thermal performance with high absorptivity (alpha > 0.95) and low emissivity (epsilon < 0.1) in the desired wavelength ranges.