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Low-Bandgap Dimeric Porphyrin for 10% Efficiency Solar Cells with Small Photon Energy Loss

Abstract

Dimeric porphyrin molecules have great potential as donor materials for high performance bulk heterojunction organic solar cells (OSCs). Recently reported dimeric porphyrins bridged by ethynylenes showed power conversion efficiencies (PCEs) of more than 8%. In this study, we design and synthesize a new conjugated dimeric D-A porphyrin ZnP2BT-RH, in which the two porphyrin units are linked by an electron accepting benzothiadiazole (BT) unit. The introduction of BT unit enhances the electron delocalization, resulting in a lower highest occupied molecular orbital (HOMO) energy level and an increased molar extinction coefficient at the near-infrared (NIR) region. The bulk heterojunction solar cells with ZnP2BT-RH as the donor material exhibit a high PCE up to 10% with a low energy loss (Eloss) of only 0.56 eV. The 10% PCE is the highest for porphyrin-based OSCs with a conventional structure, and this Eloss is also the smallest among the small molecule-based OSCs with a PCE higher than 10% to date.

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Publication details

The article was received on 20 Jun 2018, accepted on 26 Jul 2018 and first published on 26 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05903A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Low-Bandgap Dimeric Porphyrin for 10% Efficiency Solar Cells with Small Photon Energy Loss

    L. xiao, T. Lai, X. Liu, F. Liu, T. P. Russell, Y. Liu, F. Huang, X. Peng and Y. Cao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05903A

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