Subtle Morphology Control with Binary Additives for High-Efficiency Non-Fullerene Acceptor Organic Solar Cells

Yunqian Ding; Xin Zhang; Huanran Feng; Xin Ke; Lingxian Meng; Yanna Sun; Ziqi Guo; Yao Cai; Cancan Jiao; Xiangjian Wan; Chenxi Li; Nan Zheng; Zengqi Xie; Yongsheng Chen

doi:10.1021/acsami.0c05331

Subtle Morphology Control with Binary Additives for High-Efficiency Non-Fullerene Acceptor Organic Solar Cells

ACS Appl Mater Interfaces. 2020 Jun 17;12(24):27425-27432. doi: 10.1021/acsami.0c05331. Epub 2020 Jun 5.

Authors

Yunqian Ding¹, Xin Zhang², Huanran Feng², Xin Ke², Lingxian Meng², Yanna Sun², Ziqi Guo², Yao Cai², Cancan Jiao², Xiangjian Wan², Chenxi Li², Nan Zheng³, Zengqi Xie³, Yongsheng Chen²

Affiliations

¹ School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
² State Key Laboratory and Institute of Elemento-Organic Chemistry, The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China.
³ Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South, China University of Technology, Guangzhou 510640, China.

PMID: 32466636
DOI: 10.1021/acsami.0c05331

Abstract

Adding an additive is one of the effective strategies to fine-tune active layer morphology and improve performance of organic solar cells. In this work, a binary additive 1,8-diiodooctane (DIO) and 2,6-dimethoxynaphthalene (DMON) to optimize the morphology of PBDB-T:TTC8-O1-4F-based devices is reported. With the binary additive, a power conversion efficiency (PCE) of 13.22% was achieved, which is higher than those of devices using DIO (12.05%) or DMON (11.19%) individually. Comparison studies demonstrate that DIO can induce the acceptor TTC8-O1-4F to form ordered packing, while DMON can inhibit excessive aggregation of the donor and acceptor. With the synergistic effect of these two additives, the PBDB-T:TTC8-O1-4F blend film with DIO and DMON exhibits a suitable phase separation and crystallite size, leading to a high short-circuit current density (J_sc) of 23.04 mA·cm^-2 and a fill factor of 0.703 and thus improved PCE.

Keywords: binary additives; non-fullerene acceptor; organic solar cells; synergistic effect.