A low-bandgap dimeric porphyrin molecule for 10% efficiency solar cells with small photon energy loss

Xiao, Liangang; Lai, Tianqi; Liu, Xiang; Liu, Feng; Russell, Thomas P.; Liu, Yi; Huang, Fei; Peng, Xiaobin; Cao, Yong

doi:10.1039/c8ta05903a

Title: A low-bandgap dimeric porphyrin molecule for 10% efficiency solar cells with small photon energy loss

Journal Article · Thu Jul 26 00:00:00 EDT 2018 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/c8ta05903a· OSTI ID:1599784

^[1]; Lai, Tianqi ^[1]; Liu, Xiang ^[1]; Liu, Feng ^[2];

^[3];

^[1];

^[1]; Cao, Yong ^[1]

South China Univ. of Technology, Guangzhou (China)
Shanghai Jiaotong Univ. (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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 the BT unit enhances the electron delocalization, resulting in a lower highest occupied molecular orbital (HOMO) energy level and an increased molar extinction coefficient in the near-infrared (NIR) region. The bulk heterojunction solar cells with ZnP2BT-RH as the donor material exhibit a high PCE of up to 10% with a low energy loss (E_loss) of only 0.56 eV. Finally, the 10% PCE is the highest for porphyrin-based OSCs with a conventional structure, and this E_loss is also the smallest among those reported for small molecule-based OSCs with a PCE higher than 10% to date.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; International Science and Technology Cooperation Program of China; US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: AC02-05CH11231; 51773065; 51473053; 2017YFA0206602; 2013DFG52740; N00014-15-1-2244

OSTI ID:: 1599784

Journal Information:: Journal of Materials Chemistry. A, Vol. 6, Issue 38; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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