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Within light sensing optoelectronic devices, multijunction organic and hybrid photodetectors show a large potential. In particular, organic and hybrid phototransistors hold promises for high-sensitivity thanks to their inherent signal-amplification characteristics. However, often a trade-off between a large sensing area, a fast response, and a high specific detectivity is difficult to be achieved. Here we propose an alternative phototransistor concept, that relies on a geometrically engineered large area tri-channel architecture, applied to a multilayer hybrid phototransistor composed of an inorganic In2O3/ZnO n-type field-effect channel, and a top organic bulk-heterojunction or hybrid perovskite light-sensing layer. Up-scalable solution-processing of both the field-effect channel and the light-sensing layers are implemented. Different photoactive layers are used to corroborate and validate the proposed concept. The resulting …