Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Organic solar cells (OSCs) have been studied for its advantages such as solution processing, low cost and flexibility. Although the researches of active layer materials develop high efficiency of OSCs, mismatch bandgap between active layer and interlayer causes energy loss problem. Zinc oxide is well-known inorganic material used as the electron transport layer (ETL). But it has poor interfacial compatibility and LUMO level alignment with active layer. To solve these problems, we designed and synthesized acceptor-donor(A-D) type polymer as ETL. The naphthalene diimide was used as an acceptor to improve charge carrier mobility because of its high electron affinity and planarity. We selected fluorene as a donor for its facile tunability to achieve favorable energy level alignment. And we introduced selenophene as a spacer for reducing bandgap and improving the charge mobility. The synthesized polymer showed good performance by solving the energy loss problem.
This research was supported by New & Renewable Energy Core Technology Programs (Grants 20193091010110) and Human Resources program in Energy Technology (No. 20194010201790) of the Korean Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Ministry of Trade, Industry & Energy, Republic of Korea.
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