On the base of analysis of radiative characteristics of objects and backgrounds, main requirements to photodetectors of new generation for spaceborne, air-borne and ground-based optical-electronic complexes meant for sounding and monitoring of the Earth surface, atmosphere and outer space were formulated. Taking into account complicated tasks of weak radiative sources detection we propose to widen works on development of "looking" matrices and matrices functioning in the regime of temporal delay and accumulation (TDA) of large formats.