Although the power conversion efficiency (PCE) of organic photovoltaic (OPV) devices has recently improved to more than 16%, halogenated solution processes are typically employed to obtain optimal performance. However, halogenated processing is harmful to health and the environment, which can be a significant obstacle to commercialization. Therefore, development of active materials processable under halogen-free conditions is of great importance in this field. In this study, a 16.04% OPV device, processed under halogen-free conditions, is developed by employing a new active-blend system, PBDTTPD-HT:BTP-2F-BO. It is highly soluble in halogen-free solvents, forming a preferential bulk-heterojunction morphology. The PBDTTPD-HT:BTP-2F-BO device achieves a PCE comparable with current state-of-the-art devices based on PBDB-TF:BTP-4F (also known as PM6:Y6) using a conventional halogenated process (16.40% versus 16.33%). Furthermore, it demonstrates a significantly higher PCE than the PBDB-TF:BTP-4F device with a halogen-free process (16.04% versus 9.70%).
Bibliographical noteFunding Information:
The authors gratefully acknowledge support from National Research Foundation (NRF) grants funded by the Ministry of Science, ICT & Future Planning of Korea ( 2016R1A5A1012966 , 2019R1A2C2087218 , and 2020M1A2A2080746 ).
The authors gratefully acknowledge support from National Research Foundation (NRF) grants funded by the Ministry of Science, ICT & Future Planning of Korea (2016R1A5A1012966, 2019R1A2C2087218, and 2020M1A2A2080746). The work was conceived by F.T.A.W. and S.-Y.J. The experiments were performed by F.T.A.W. N.V.K. S.S. and W.T.H. under guidance of S.-Y.J. and Y.R.D. The polymer donors were synthesized and characterized by F.T.A.W. The small-molecule acceptors were synthesized and characterized by N.V.K. and S.S. The devices were fabricated and characterized by F.T.A.W. and W.T.H. The anti-reflection layers were prepared by S.L. The manuscript was written by F.T.A.W. and S.-Y.J. with comments and input from all authors. The authors declare no competing interests.
© 2021 The Authors
- organic photovoltaic
- polymer donor
- small molecule acceptor
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Materials Science(all)