Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Perovskite solar cells employing ABX₃-type semiconductors (A = CH₃NH₃⁺ (MA⁺), (NH₂)₂CH⁺ (FA⁺), Cs⁺, etc.; B = Pb²⁺, Sn²⁺; X = I⁻, Br⁻, Cl⁻) as light-absorbing layers have attracted considerable attention as promising next-generation solution-processable photovoltaic devices. Recently, monolayer materials have emerged as promising hole-collecting materials (HCMs) owing to their higher optical transparency compared with conventional bulk materials[1,2]. However, their long-term stability remains a challenge. In this study, we developed an ultrathin cross-linked molecular film that combines high optical transparency with enhanced durability by utilizing the thiol–yne reaction.
A newly synthesized terminal ethynyl compound, IT-Et (Figure 1a), and 1,3,5-benzenetrithiol were employed as the precursors for the thiol–yne reaction. A mixed solution of these compounds was spin-coated onto an ITO substrate, followed by thermal treatment to induce an in-situ cross-linking reaction on the substrate. Subsequent rinsing afforded an ultrathin, solvent-insoluble cross-linked molecular film, cIT-Et (Figure 1b).We hypothesize that interactions with the ITO surface facilitate the retention of an ultrathin cross-linked molecular network upon rinsing, while excess material is removed. Consequently, the resulting polymer film is expected to form a nearly monolayer-thick structure on the ITO surface, largely independent of the initial coating concentration (Figure 1b).
Using cIT-Et as the HCM, we fabricated p-i-n-type lead-based perovskite solar cells (Figure 1c) and evaluated their photovoltaic performance. Devices employing cIT-Et deposited from an 8 mg/mL precursor solution achieved an open-circuit voltage of 1.07 V and a power conversion efficiency (PCE) of 22.6%. Notably, even when the coating concentration of cIT-Et precursor was reduced to 2 mg/mL, the resulting devices maintained a PCE of 21.9%. Improved stability under reverse-bias conditions was also demonstrated compared with monomeric HCMs. In this presentation, we will discuss the properties of the ultrathin cross-linked molecular film and its effects on the efficiency and stability of perovskite solar cells in detail.
This research is financially supported by JSPS, IRCCS, 学術変革(A) (led by Prof. S. Yamaguchi), JST Mirai and NEDO.
The MW and TEM measurements were conducted by Toray Research Center, Inc.
This work was supported by JST SPRING, Grant Number JPMJSP2110.
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.