Journal
ORGANIC ELECTRONICS
Volume 21, Issue -, Pages 184-191Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2015.03.017
Keywords
Non-fullerene; Organic solar cells; Perylene monoimides; Fluorene; P3HT
Funding
- National Natural Science Foundation of China [21174022, 21376038, 21421005]
- National Basic Research Program of China [2013CB733702]
- Specialized Research Fund for the Doctoral Program of Higher Education [20110041110009]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1213]
- Fundamental Research Funds for the Central Universities [DUT14YQ103, DUT14LK02]
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A fluorene-centered perylene monoimide dimer, PMI-F-PMI with a partly non-coplanar configuration has been developed as a potential non-fullerene acceptor for organic solar cells (OSCs). The optimum power conversion efficiency (PCE) of the OSC based on PMI-F-PMI as acceptor and poly (3-hexyl thiophene) (P3HT) as donor is up to 2.30% after annealing at 150 degrees C. The PCE of 2.30% is the highest value for the OSCs based on P3HT donor and non-fullerene acceptor lies in that PMI-F-PMI's lowest unoccupied molecular orbital (LUMO) level around -3.50 eV matches well with the donor P3HT to produce higher open-circuit voltage (V-oc) of 0.98 V. Meanwhile, PMI-F-PMI makes remarkable contribution to devices' light absorption as the maximum EQE (30%) of the devices is at 512 nm, same to the maximum absorption wavelength of PMI-F-PMI. The other favorable characteristics of PMI-F-PMI in bulk heterojunction (BHJ) active layers is proved through the photo current density measures, the relatively balanced electron-hole transport, and the smooth morphology with root mean square (RMS) value of 1.86 nm. For these advantages, PMI-F-PMI overwhelms its sister PMI-F and parent PMI as an acceptor in BHJ solar cells. (C) 2015 Elsevier B.V. All rights reserved.
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