ENERGY SENSITIZATION OF ACCEPTORS AND DONORS IN ORGANIC PHOTOVOLTAICS

摘要

Disclosed herein are organic photosensitive optoelectronic devices comprising acceptor and/or donor sensitizers to increase absorption and photoresponse of the photoactive layers of the devices. In particular, devices herein include at least one acceptor layer and at least one donor layer, wherein the acceptor layer may comprise a mixture of an acceptor material and at least one sensitizer, and the donor layer may comprise a mixture of a donor material and at least one sensitizer. Methods of fabricating the organic photosensitive optoelectronic devices are also disclosed.

主权项

1. An organic photosensitive optoelectronic device comprising:
two electrodes in superposed relation; a mixed organic acceptor layer and an organic donor layer located between the two electrodes, wherein the mixed organic acceptor layer comprises a mixture of an acceptor material and at least one acceptor sensitizer, wherein the acceptor material and the at least one acceptor sensitizer are chosen to satisfy the following conditions:
the at least one acceptor sensitizer has a lowest triplet excited state energy (ET-ASens) greater than or equal to a lowest triplet excited state energy (ET-A) of the acceptor material;the at least one acceptor sensitizer has a reduction potential lower than or equal to a reduction potential of the acceptor material; andif the at least one acceptor sensitizer and the acceptor material form a charge transfer (CT) state having a CT state energy, the CT state energy is greater than or equal to the lowest triplet excited state energy (ET-A) of the acceptor material.