A maskless laser-write lithography processing of thin-film transistors on a hemispherical surface
We report on the design and fabrication methods for a hydrogenated amorphous silicon (a-Si:H) thin-film transistors (TFTs) on a non-planar substrate using laser-write lithography (LWL). Level-to-level alignment with a high accuracy is demonstrated using LWL method. The fabricated a-Si:H TFT exhibits a field-effect mobility of 0.27cm2/Vs, threshold voltage of 4.9V and on/off current ratio of ?6106 in a saturation regime. The obtained results demonstrate that it is possible to fabricate the a-Si:H TFTs and complex circuitry on a curved surface, using a well-established a-Si:H TFT technology in combination with the maskless lithography, for hemispherical or non-planar sensor arrays.
thin-film transistor maskless lithography non-planar surface