We explore two small molecules containing arms of dicyano-n-hexylrhodanine and diathiafulvalene wings terminated with benzothiadiazole linker, denoted as BAF-4CN and BAF-2HDT, respectively, as small molecule non-fullerene acceptors (SMNFAs) in organic solar cells. The proposed materials are mixed with a low band gap polymer donor PTB7-Th having broad absorption in the range of 400–750 nm to form solution-processed bulk heterojunctions (BHJs). The photoluminescence (PL) measurements show that both donor and acceptor can quench each other’s PL effectively, implying that not only electrons are transferred from PTB7-Th → SMNFAs but also holes are transferred from SMNFAs → PTB7-Th for efficient photocurrent generation. Furthermore, solvent vapor annealing (SVA) processing is shown to yield a more balanced hole and electron mobility and thus suppresses the trap-assisted recombination significantly. With this dual charge transfer enabled via fine-tuning of end-groups and SVA treatment, power conversion efficiency of approximately 10% is achieved, demonstrating the feasibility of the proposed approach.

A small molecule non-fullerene acceptor based on a fluorene core having a furan π-spacer and end capped with rhodanine (FRd₂) is developed for solution processable bulk heterojunction organic solar cells (OSCs).

This work investigates the synthesis of Cesium (Cs) based all-inorganic (CsPbBr₃) perovskite single crystals (PSCs) at low temperatures (45 °C) for application in photosensitive devices.

In this article, we describe a simple, low-cost, and environment friendly sol-gel technique to form an effective protective Y ₂ O ₃ layer over the core ZnO surface. The synthesized ZnO/Y ₂ O ₃ core/shell nanoparticles have been studied for the investigation of morphology, purity, structure, luminescence, and electronic properties using different characterization techniques. The average particle size has been calculated to be 40 nm (approx). Scanning electron microscopy images show that the synthesized nanomaterials have particle-like morphology with spherical shape while high-resolution transmission electron microscopy analysis confirms their core/shell structure. Furthermore, ZnO/Y ₂ O ₃ sample has been investigated as an electron transport layer (ETL) in inverted organic solar cell (OSC) with a blend of poly{4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b’]dithio phene-2,6-diyl-alt-3-fluoro-2-[(2ethylhexyl)carbonyl]thieno [3,4-b]thiophene-4,6-diyl} (PTB7), and [6,6]-phenyl-C ₇₁ -butyric acid methyl ester (PC ₇₁ BM) as an active layer. On comparing with the standard device having pure ZnO as ETL, the power conversion efficiency of PTB7:PC ₇₁ BM based device with ZnO/Y ₂ O ₃ as ETL is efficiently improved from 5.77% to 6.22%. This study provides an economical method to increase the efficiency of OSCs.

The growth of FA-based mixed halide perovskite single-crystal via the ITC method has been investigated and characterized to detect its photosensitive properties. The photophysical, responsivity and detectivity also has been investigated.