High-Performance Nonfullerene Organic Photovoltaic Cells Using a TPD-Based Wide Bandgap Donor Polymer
- Authors
- Park, Jong Baek; Ha, Jong-Woon; Jung, In Hwan; Hwane, Do-Hoon
- Issue Date
- Aug-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- TPD-based polymer; wide band gap donnor polymer; nonfullerene acceptors; organic photovoltaics; molecular weight
- Citation
- ACS APPLIED ENERGY MATERIALS, v.2, no.8, pp.5692 - 5697
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED ENERGY MATERIALS
- Volume
- 2
- Number
- 8
- Start Page
- 5692
- End Page
- 5697
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/13214
- DOI
- 10.1021/acsaem.9b00835
- ISSN
- 2574-0962
- Abstract
- Organic photovoltaics (OPVs) consisting of a wide bandgap polymer donor and a nonfullerene acceptor (NFA) have received attention because they can effectively overcome the weaknesses of efficiency and stability for fullerene-based OPVs. One of the NFAs, ITIC, shows an excellent power conversion efficiency, as well as controllable solubility, absorption, crystallinity, and energy level. Thus, high-efficiency OPVs could be achieved by developing polymer donors appropriate for use with ITIC-based OPVs. In this study, the synthesized polymer donor, PBDTT-8ttTPD, containing alkylthieno[3,2-b]thiophene as pi-bridge and thieno[3,4-c]pyrrole-4,6(5H)-dione (ttTPD) shows strong absorption with a sharp peak edge at around 700 nm. In addition, the high hole mobility and face-on oriented polymer structures in the blend films make ttTPD the best candidate for the donor in NFA-based OPVs. Notably, the molecular weight of the face-on preferred polymer donor is crucial for determining the power conversion efficiency (PCE) of the NFA-based devices. A high molecular weight improves the pi-pi stacking ordering, absorption, and nanomorphology of the blend films, resulting in a dramatic PCE improvement from 5.76% to 11.05% compared with that of the fullerene-based OPV device (7.86%).
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