Realizing Efficient Charge/Energy Transfer and Charge Extraction in Fullerene-free Organic Photovoltaics via a Versatile Third Component.

08:00 EDT 12th July 2019 | BioPortfolio

Summary of "Realizing Efficient Charge/Energy Transfer and Charge Extraction in Fullerene-free Organic Photovoltaics via a Versatile Third Component."

Solution-processed organic photovoltaics (OPVs) based on bulk-heterojunctions have gained significant attention to alleviate the increasing demend of fossil fuel in past two decades. OPVs combined of a wide bandgap polymer donor and a narrow bandgap non-fullerene acceptor show potential to achieve high performance. However, there are still two reasons to limit the OPVs performance. One, although this combination can expand from ultraviolet to near infrared region, the overall external quantum efficiency of device suffers low values. The other one is the low open-circuit voltage (VOC) of devices resulting from the relatively downshifted lowest unoccupied molecular orbital (LUMO) of the narrow bandgap. Herein, the approach to select and incorporate a versatile third component into the active layer is reported. A third component with bandgap larger than that of the acceptor, and absorption spectra and LUMO levels lying within that of the donor and acceptor is demonstrated to be effective conquer these issues. As a result, the power conversion efficiencies (PCEs) are enhanced by the elevated short-circuit current and VOC; the champion PCE are 11.1% and 13.1% for PTB7-Th:IEICO-4F based and PBDB-
Y1 based solar cells, respectively.


Journal Details

This article was published in the following journal.

Name: Nano letters
ISSN: 1530-6992


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