11 January 2024 | Arshiya Ansari, Shahzad Ahmed, Moin Ali Siddiqui, Afzal Khan, Amitava Banerjee, Devendra Singh Negi, and Pranay Ranjan
The study investigates the fabrication and performance of hybrid titanium dioxide (TiO₂) nanoparticles and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) embedded with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and carbon quantum dots (CQDs) on a p-type silicon (p-Si) substrate using the drop-casting method. The structural analysis was conducted using Raman spectroscopy. The devices were tested under UV radiation (365 nm, 200 mW cm⁻²) to observe changes in conductivity. The TiO₂/PEDOT:PSS/LiTFSI device demonstrated a responsivity of 25.3% with response/recovery times of 467/577 seconds, while the CQDs:TiO₂/PEDOT:SS/LiTFSI device showed a responsivity of 22.2% with response/recovery times of 300/393 seconds. The design methodology is promising for fabricating sensors to detect harmful UV rays, which can contribute to various dermatological conditions such as premature aging, sunburn, cataracts, and skin cancer. The study highlights the potential of polymer-based UV photodetectors, which offer advantages such as cost-effectiveness, ease of processing, and energy efficiency.The study investigates the fabrication and performance of hybrid titanium dioxide (TiO₂) nanoparticles and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) embedded with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and carbon quantum dots (CQDs) on a p-type silicon (p-Si) substrate using the drop-casting method. The structural analysis was conducted using Raman spectroscopy. The devices were tested under UV radiation (365 nm, 200 mW cm⁻²) to observe changes in conductivity. The TiO₂/PEDOT:PSS/LiTFSI device demonstrated a responsivity of 25.3% with response/recovery times of 467/577 seconds, while the CQDs:TiO₂/PEDOT:SS/LiTFSI device showed a responsivity of 22.2% with response/recovery times of 300/393 seconds. The design methodology is promising for fabricating sensors to detect harmful UV rays, which can contribute to various dermatological conditions such as premature aging, sunburn, cataracts, and skin cancer. The study highlights the potential of polymer-based UV photodetectors, which offer advantages such as cost-effectiveness, ease of processing, and energy efficiency.