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High-performance and high-stability all-polymer photomultiplication-type organic photodiode using an NDI-based polymer acceptor with precisely controlled backbone planarity

Title of paper
High-performance and high-stability all-polymer photomultiplication-type organic photodiode using an NDI-based polymer acceptor with precisely controlled backbone planarity
Author
[정대성교수 연구실] 분자구조 제어를 이용한 고안정성 이미지센서 개발
Publication in journal
Advanced Functional Materials
Publication date
20220801

 

[Abstract]

It is shown that the performance and the operational stability of an all-polymer photomultiplication-type organic photodiode (PM-OPD) can be significantly enhanced by realizing near-ideal spatial isolation of polymer acceptor via a synthetic approach. A series of new naphthalenediimide-based D–A polymer acceptors, PNDI–Ph, PNDI–Tol, and PNDI–Xy, with different degrees of backbone planarity are synthesized. By introducing benzene, toluene, and p–xylene as the donor units, increasing intramolecular torsional angle is expected. Thus, 2D grazing-incidence X-ray diffraction reveals the highest paracrystalline disorder in the PNDI–Xy thin film. Furthermore, PNDI–Xy has the lowest surface energy resulting in the smallest surface energy difference with matrix donor polymer, poly(3-hexylthiophene-diyl) (P3HT). When combined with P3HT, the less aggregated and low surface energy nature of PNDI–Xy results in near-ideal spatial isolation. Consequently, the all-polymer PM-OPD yielded a high external quantum efficiency of 770 000% with specific detectivity of 3.06 × 1013 Jones. The physics behind the success of PNDI–Xy in PM-OPD is discussed in conjunction with temperature-dependent current density-voltage analyses and drift-diffusion simulations. Furthermore, the use of polymer acceptor enables the resulting PM-OPD to retain its performance for 24 h, with significantly improved operational stability.

 

DOI: 10.1002/adfm.202204383

LINK: https://doi.org/10.1002/adfm.202204383