Proceedings of Asia-Pacific Conference on Perovskite, Organic Photovoltaics&Optoelectronics (IPEROP25)
Publication date: 17th October 2024
Copper(I) thiocyanate (CuSCN) has become an ubiquitous p-type semiconductor used in a wide range of electronic and optoelectronic applications. However, solution-processed CuSCN films from diethyl sulfide (DES) solvent usually contain defective coordination environments, particularly SCN− vacancies (VSCN), which are detrimental to p-type conductivity due to their donor-like states near the conduction band minimum. In this work, we present a defect passivation strategy by doping CuSCN with copper(II) bromide (CuBr2) as Br− exhibits a similar ionic radius to that of SCN− while Cu2+ can act as a hole producer. The substitution of Br− to VSCN is revealed by X-ray absorption spectroscopy, showing the recovery of coordination environments around Cu+ centers. Moreover, X-ray diffraction shows the preferential orientation in CuBr2-doped CuSCN (CuSCN:CuBr2), which promotes better hole transport through the Cu-S planes having more dispersive hole states. Thin-film transistors fabricated using CuSCN:CuBr2 as the p-channel exhibit an 8-fold increase in field-effect hole mobility to 0.08 cm2 V-1 s-1 compared to reference devices based on undoped CuSCN. Furthermore, CuSCN:CuBr2 employed as a hole transport layer (HTL) in organic solar cells (conventional structure), i.e., PM6:L8-BO and PM6:D18:L8-BO (ternary) can mitigate the S-shape in the current density-voltage (J-V) characteristics typically associated with the HTL based on undoped CuSCN. In effect, CuBr2 doping results in a higher charge collection probability and reduced trap-assisted recombination, yielding a power conversion efficiency of 18.3% compared to 15.5% of reference devices (ternary system). We also explore single-component organic photodiodes (OPDs), an emerging technology, using Y6 as the light absorber. Resulting OPDs with CuSCN:CuBr2 outperform reference devices in all figures of merit: 1-order of magnitude higher specific detectivity (1012 Jones) at -2 V. The universal performance improvements across various devices highlight the importance of defect engineering in CuSCN, a widely used hole-transport material.
P.S. and P.P. would like to acknowledge funding from Vidyasirimedhi Institute of Science and Technology (VISTEC) and support of scientific instruments from VISTEC’s Frontier Research Center (FRC). This project is funded by National Research Council of Thailand (NRCT), grant no. N42A650255 and N42A650196. This material is based upon work supported by the Air Force Office of Scientific Research under award number FA2386-22-1-4082.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.