Extraction of photogenerated electrons and holes from a covalent organic framework integrated heterojunction.

ABSTRACT: Covalent organic frameworks (COFs) offer a strategy to position molecular semiconductors within a rigid network in a highly controlled and predictable manner. The π-stacked columns of layered two-dimensional COFs enable electronic interactions between the COF sheets, thereby providing a path for exciton and charge carrier migration. Frameworks comprising two electronically separated subunits can form highly defined interdigitated donor-acceptor heterojunctions, which can drive the photogeneration of free charge carriers. Here we report the first example of a photovoltaic device that utilizes exclusively a crystalline organic framework with an inherent type II heterojunction as the active layer. The newly developed triphenylene-porphyrin COF was grown as an oriented thin film with the donor

SUBMITTER: Calik M 

PROVIDER: S-EPMC4706362 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature