The Bulk Photovoltaic Effect (BPE) is a new quantum mechanical phenomenon, which could be observed in the 20 symmetry points group crystals without symmetry center (ferro - and piezo electrics). Up to now the BPE was observed only in the bulk crystals and shows very low conversation efficiency of light energy (e.g. solar) to electricity. The last works have shown that in ferroelectric films with nanoscale thickness the conversion efficiency could be much higher. It opens very perspective application of BPE. There two microscopy mechanisms of BPE. The first one called ballistic mechanism is connected with asymmetric distribution of non-thermalized carrier momentum and violation of Boltzmann principle of detailed balance. The second one is the shift mechanism is a new quantum mechanical phenomenon obtained by accounting for the non-diagonal elements of density matrix. The BPE in ferro- and piezoelectric crystals and films is considered. The mechanism of BPE in topological insulators and in plasmonics is discussed. The special attention is paid to the PBE in the nanoscaled perovskites and hybrid perovskites and influence of screening field of the conversion energy efficiency.
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