Green-Solvent-Processable Organic Photovoltaics with High Performances Enabled by Asymmetric Non-Fullerene Acceptors

Yi-Jia Su; Hebing Nie; Chun-Feng Chang; Sheng-Ci Huang; Yi-Hsuan Huang; Tsung-Wei Chen; Kuo-Kai Hsu; Tzu-Yuan Lee; Hung-Min Shih; Chung-Wen Ko; Jiun-Tai Chen; Chain-Shu Hsu

doi:10.1021/acsami.1c19627

Green-Solvent-Processable Organic Photovoltaics with High Performances Enabled by Asymmetric Non-Fullerene Acceptors

ACS Appl Mater Interfaces. 2021 Dec 15;13(49):59043-59050. doi: 10.1021/acsami.1c19627. Epub 2021 Dec 5.

Authors

Yi-Jia Su^{1

2}, Hebing Nie^{1

2}, Chun-Feng Chang³, Sheng-Ci Huang^{1

2}, Yi-Hsuan Huang³, Tsung-Wei Chen^{1

2}, Kuo-Kai Hsu³, Tzu-Yuan Lee³, Hung-Min Shih³, Chung-Wen Ko³, Jiun-Tai Chen^{1

2}, Chain-Shu Hsu^{1

2}

Affiliations

¹ Department of Applied Chemistry, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.
² Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.
³ Ways Technical Corp., 326 Kaoching Road, Yangmei, Taoyuan 326023, Taiwan.

PMID: 34865485
DOI: 10.1021/acsami.1c19627

Abstract

In this work, two asymmetric non-fullerene acceptors (NFAs), BTP-EHBO-4F and BTP-PHD-4F, are designed to be applied in green-solvent-processable organic photovoltaics (OPVs). BTP-EHBO-4F and BTP-PHD-4F show good solubilities in green solvent o-xylene. As a result, PM6:BTP-EHBO-4F-based devices exhibit outstanding photovoltaic performances using o-xylene as a solvent. By comparison, due to the poor solubility of Y6 in o-xylene, PM6:Y6-based devices show poor performances. Owing to the favorable phase separation, molecule packing, and orientation observed from atomic force microscopy (AFM) and grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements, PM6:BTP-PHD-4F-based devices demonstrate a PCE of 15.91% with a V_OC of 0.87 V, a J_SC of 25.64 mA/cm², and an FF of 71.34%. Moreover, PM6:BTP-EHBO-4F-based devices exhibit an impressive PCE of 16.82% with a V_OC of 0.85 V, a J_SC of 26.12 mA/cm², and an FF of 75.78%, which is outstanding for OPVs using o-xylene as a solvent.

Keywords: asymmetric non-fullerene acceptor; green-solvent; o-xylene; organic photovoltaics; side-chain engineering.