Fine Tuning Alkyl Substituents on Dithienoquinoxaline-Based Wide-Bandgap Polymer Donors for Organic Photovoltaics

Manohar Reddy Busireddy; Tsung-Wei Chen; Sheng-Ci Huang; Hebing Nie; Yi-Jia Su; Chih-Ting Chuang; Pei-Jung Kuo; Jiun-Tai Chen; Chain-Shu Hsu

doi:10.1021/acsami.2c04104

Fine Tuning Alkyl Substituents on Dithienoquinoxaline-Based Wide-Bandgap Polymer Donors for Organic Photovoltaics

ACS Appl Mater Interfaces. 2022 May 18;14(19):22353-22362. doi: 10.1021/acsami.2c04104. Epub 2022 May 5.

Authors

Manohar Reddy Busireddy^{1

2}, Tsung-Wei Chen^{1

2}, Sheng-Ci Huang^{1

2}, Hebing Nie^{1

2}, Yi-Jia Su^{1

2}, Chih-Ting Chuang^{1

2}, Pei-Jung Kuo^{1

2}, Jiun-Tai Chen^{1

2}, Chain-Shu Hsu^{1

2}

Affiliations

¹ Department of Applied Chemistry, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu 30010, Taiwan.
² Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu 30010, Taiwan.

PMID: 35511580
DOI: 10.1021/acsami.2c04104

Abstract

The molecular design of wide-bandgap conjugated polymer donors (WB-CPDs) is a promising strategy for tuning the bulk heterojunction blend film morphologies to achieve high-performance organic photovoltaic (OPV) devices. Herein, we synthesize two WB-CPDs, namely, PBQ-H and PBQ-M, with and without methyl groups on the fused-dithieno[3,2-f:2',3'-h]quinoxaline (DTQx) moiety. We systematically investigate their structure-property relationship and OPV performances. The AFM and 2D grazing-incidence wide-angle X-ray scattering (GIWAXS) studies reveal that the PBQ-H:BO-4Cl BHJ blend shows strengthened aggregation behavior and stronger π-π stacking on face-on orientation compared with the PBQ-M:BO-4Cl BHJ blend, enhancing the phase separation, charge transport, and fill factor (FF). Blend film absorption spectra, however, show that the PBQ-H:BO-4Cl BHJ blend exhibits a lower absorption coefficient than that of the PBQ-M:BO-4Cl BHJ blend, which decreases the short-circuit current density (J_SC). As a consequence, the optimized PBQ-H:BO-4Cl BHJ blend delivers a higher power conversion efficiency (PCE) of 12.88% with a J_SC of 23.97 mA/cm², an open-circuit voltage (V_OC) of 0.86 V, and an FF of 62.46%, compared with the PBQ-M:BO-4Cl BHJ blend (PCE of 11.81% with a J_SC of 24.78 mA/cm², a V_OC of 0.85 V, and an FF of 56.11%). Overall, this work demonstrates that alkyl group substitution on the DTQx moiety on the basis of WB-CPDs is critical for controlling the film morphology and thus obtaining high OPV performances.

Keywords: BHJ OPVs; BHJ-blend film morphology; dithieno[3,2-f:2′,3′-h]quinoxaline-based CPDs; power conversion efficiency; wide bandgap polymers.