26TH SYMPOSIUM ON PHOTONICS AND OPTICS SPO 2025

Session

Perovskites & Semiconductor Devices (PV/LED)

6 Nov 2025, 13:00

Room 261(Laboratory building) (Zoom and Faculty of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)

195. Self-assembled growth of high-quality InGaN ‘lotus seed pod’ structures with red emission

Dr Oksana Koplak (Università degli Studi di Milano-Bicocca)

06/11/2025, 13:00

Oral

Anisotropic epitaxial growth of free-standing InGaN nanostructures remains a key technological challenge in light-emitting device development. Here, we report precise, stepwise control of InGaN nanostructure growth on Si(111) substrates using molecular beam epitaxy (MBE). Light nitridation of the Si(111) surface created nucleation centers that promoted the well-oriented formation of hexagonal...

146. Structural and Optical Properties of Aziridinium Germanium Hybrid Perovskites

Hanna Petrosova (Taras Shevchenko National University of Kyiv)

06/11/2025, 13:20

Oral

Hybrid halide perovskites containing small organic cations continue to attract attention as semiconducting materials for optoelectronic applications, which make them promising candidates for next-generation photovoltaic and optoelectronic devices. Among them, aziridinium-based perovskites represent an emerging class of compounds with distinctive structural and optoelectronic properties,...

157. Aziridinium Cation as a Universal Building Block for HOIPs of Variable Dimensionality

Olesia Kucheriv (Taras Shevchenko National University of Kyiv)

06/11/2025, 13:35

Oral

Hybrid organic–inorganic perovskites remain at the forefront of materials research due to their tunable optoelectronic properties and structural diversity. In this work, we present a family of aziridinium-based hybrid perovskite-like materials of general formula (AzrH)₃M₂X₉ (M = Sb, Bi; X = Cl, Br, I), where the aziridinium cation (AzrH)⁺ acts as a versatile structure-directing template...

161. 2D Hybrid Perovskite with Narrow-Band Violet-Blue Emission

Dr Valerii Sirenko (Department of Chemistry, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)

06/11/2025, 13:50

Oral

Hybrid organic-inorganic perovskites constitute a rapidly-growing family of solid-state semiconducting materials with remarkable potential in optoelectronic and photovoltaic applications. Their highly-tunable chemical composition enables emission across a broad spectral range; however, efficient violet-blue emitting perovskites remain relatively scarce. In this work, we present the synthesis,...

145. Backside surface engineering for improved performance of CIGS and CZTS solar cells: application of titanium dioxide (TiO ) and graphene oxide (rGO) layer

Dr DOUNIA FATIHI (University of Hassan II Casablanca)

06/11/2025, 14:05

Oral

This work was conducted at the Ben M'Sik Faculty of Sciences, Engineering and Materials Laboratory (LIMAT) (Nanomaterials and Thin Films Team). This study is part of research efforts aimed at addressing global energy challenges. These challenges are caused in particular by rapid population growth, increased urbanization, and exponential energy demand. Faced with the progressive depletion of...

149. Mn-Doped BaSnO₃ Perovskites for Next-Generation Optoelectronics: A First-Principles Investigation

YOUNES ELALAOUI (Faculty of Sciences Ben M’Sik, Hassan II University of Casablanca, B.P.7955, Morocco)

06/11/2025, 14:20

Oral

Perovskite oxides with the general formula ABO₃ offer highly tunable physical properties through substitution at the A and B lattice sites. In this work, manganese (Mn) was introduced into BaSnO₃ to evaluate its impact on structural, electronic, and optical properties. First-principles calculations were performed using density functional theory (DFT) within the pseudopotential plane-wave...