Energy Level Tuning of Non-Fullerene Acceptors in Organic Solar Cells.

ABSTRACT: The use of non-fullerene acceptors in organic photovoltaic (OPV) devices could lead to enhanced efficiencies due to increased open-circuit voltage (VOC) and improved absorption of solar light. Here we systematically investigate planar heterojunction devices comprising peripherally substituted subphthalocyanines as acceptors and correlate the device performance with the heterojunction energetics. As a result of a balance between VOC and the photocurrent, tuning of the interface energy gap is necessary to optimize the power conversion efficiency in these devices. In addition, we explore the role of the charge transport layers in the device architecture. It is found that non-fullerene acceptors require adjusted buffer layers with aligned electron transport levels to enable efficient charge ex

SUBMITTER: Cnops K 

PROVIDER: S-EPMC5538756 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature