Akademik Veri Yönetim Sistemi
Journal of Materials Science: Materials in Electronics, cilt.36, sa.33, 2025 (SCI-Expanded, Scopus)
This study investigates the electrical transport and optoelectronic properties of polymer-based nanocomposite thin films, specifically pristine polyvinylpyrrolidone (PVP) and PVP:TlInS2 composites, fabricated as photodetectors on n-Si substrates. Current–voltage (I–V) measurements revealed rectifying behavior characteristic of Schottky-like junctions, with current transport primarily governed by thermionic emission, albeit influenced by non-ideal factors, such as interface states and series resistance. The incorporation of TlInS2 significantly enhanced the electrical conductivity of the composite film by orders of magnitude compared to pristine PVP, attributed to improved charge transport pathways. Illumination-dependent I–V characteristics demonstrated an apparent increase in photocurrent with increasing light intensity for both devices. Quantitative analysis of optoelectronic parameters showed that the PVP:TlInS2 composite exhibited superior responsivity (up to 0.513 A/W) and achieved an external quantum efficiency exceeding 100% (up to 117.1%), indicating photoconductive gain. Crucially, the composite device demonstrated a remarkably low noise equivalent power (10−14 W/Hz1/2) and a high detectivity (> 1013 cm Hz1/2/W), representing a two order-of-magnitude improvement over the pristine PVP. This enhanced sensitivity is primarily due to the substantial reduction in dark current. Furthermore, time-dependent photocurrent measurements confirmed the device’s stable, fast, and repeatable “On–Off” switching capabilities. These findings highlight the potential of PVP:TlInS2 nanocomposites for developing high-performance, sensitive, and efficient optoelectronic devices.