Speaker
Description
Surface and interface phenomena critically determine the performance and stability of emerging electronic and energy materials. At the Laboratory for Organic Electronics (LOE), we investigate the physical and chemical processes governing interfaces in organic semiconductors, perovskites, and bio-derived materials using advanced spectroscopy and synchrotron radiation. Experiments at facilities such as the MAX IV Laboratory, BESSY II, UVSOR Synchrotron Facility, and ASTRID2 Synchrotron Light Source enable detailed characterization of electronic structure, chemical states, and interface energetics.
This poster presents representative studies from our group illustrating how X-ray–based techniques provide insight into functional materials. Investigations of donor–acceptor heterojunctions in organic photovoltaics reveal abrupt vacuum-level shifts and interface dipoles that influence charge-transfer energetics.[1] Additional work explores environmental effects on the work function of organic semiconductors, as well as sustainable interface strategies including lignin-based cathode interface layers and water-processable conductive polymers.[2], [3] [4] In parallel, we investigate transition-metal-doped halide double perovskites exhibiting long spin coherence times, highlighting their potential for quantum technologies.[5]
By presenting these studies, we aim to engage with the large-scale facility community, exchange perspectives on advanced characterization approaches, and explore opportunities for future collaborative investigations of complex material interfaces.
[1] X. Li et al., “Mapping the energy level alignment at donor/acceptor interfaces in non-fullerene organic solar cells,” Nat Commun, vol. 13, no. 1, p. 2046, Apr. 2022, doi: 10.1038/s41467-022-29702-w.
[2] X. Li, Q. Zhang, Y. Chen, X. Liu, S. Braun, and M. Fahlman, “Fermi Level Shifts of Organic Semiconductor Films in Ambient Air,” ACS Appl. Mater. Interfaces, vol. 17, no. 3, pp. 5153–5164, Jan. 2025, doi: 10.1021/acsami.4c13674.
[3] T. Liu et al., “Ground-state electron transfer in all-polymer donor:acceptor blends enables aqueous processing of water-insoluble conjugated polymers,” Nat Commun, vol. 14, no. 1, p. 8454, Dec. 2023, doi: 10.1038/s41467-023-44153-7.
[4] Q. Zhang et al., “Industrial Kraft Lignin Based Binary Cathode Interface Layer Enables Enhanced Stability in High Efficiency Organic Solar Cells,” Advanced Materials, vol. 36, no. 9, p. 2307646, Mar. 2024, doi: 10.1002/adma.202307646.
[5] S. Khamkaeo et al., “Spin Qubits Candidate in Transition-Metal-Ion doped Halide Double Perovskites,” Nat Commun, Jan. 2026, doi: 10.1038/s41467-025-67980-2.