Panchromatic Ternary Organic Solar Cells with Porphyrin Dimers and Absorption-Complementary Benzodithiophene-based Small Molecules.

ACS Appl Mater Interfaces

Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials , Hong Kong Baptist University, Waterloo Road, Kowloon Tong , Hong Kong , P. R. China.

Published: February 2019

Diketopyrrolopyrrole-ethynylene-bridged porphyrin dimers are capped with electron-deficient 3-ethylrhodanine (A) via a π-bridge of phenylene ethynylene, affording two new acceptor-donor-acceptor structural porphyrin dimers (DPP-2TTP and DPP-2TP) with strong absorption in ranges of 400-550 nm (Soret bands) and 700-900 nm (Q bands). Their intrinsic absorption deficiency between the Soret and Q bands could be perfectly compensated by a wide-bandgap small molecule DR3TBDTTF (D*) with absorption at 500-700 nm. Impressively, the optimal ternary device based on the blend films of DPP-2TPP, DR3TBDTTF (20 wt %), and PCBM shows a PCE of 11.15%, whereas the binary devices based on DPP-2TTP/PCBM and DPP-2TP/PCBM blend films exhibit PCEs of 9.30 and 8.23%, respectively. The high compatibility of the low bandgap porphyrin dimers with the wide-bandgap small molecule provides a new threesome with PCBM for highly efficient panchromatic ternary organic solar cells.

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http://dx.doi.org/10.1021/acsami.8b19240DOI Listing

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