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Kumar Ravindra,Saha Jhuma,Tongbram Binita,Panda Debiprasad,Gourishetty Raveesh,Kumar Ravinder,Gazi Sanowar Alam,Chakrabarti Subhananda 한국물리학회 2023 Current Applied Physics Vol.47 No.-
In this work, the authors introduced a novel approach called digital alloy capping layer (DACL) and investigated its effect on the optical and structural properties of InAs quantum dot-in-a-well (DWELL) heterostructures. In DACL, a conventional thick well layer is digitized equally with different compositions analogous to short-period-superlattice (SPS). The DACL approach’s effect has been studied experimentally and theoretically on DWELL heterostructures with InxGa1-xAs as the well material. The photoluminescence (PL) study reveals that DACL observes a red-shift of ~55 nm as compared to AACL approached heterostructures. High-resolution X-ray diffraction (HRXRD) results reveal higher In-content, controlled In-out diffusion from InAs QD, and improved in-plane strain in DACL samples compared to the analog sample. The study has been extended to QD heterostructures with GaAs1-xNx and GaAs1-ySby as well materials, and comprehensive analysis has been carried out. Hence, the DWELL heterostructures with the DACL approach can be utilized to fabricate infrared photodetector devices.
Sudarshana Banerjee,Bibhutibhushan Show,Avra Kundu,Jhuma Ganguly,Utpal Gangopadhyay,Hiranmay Saha,Nillohit Mukherjee 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
We report the synthesis of an amino acid viz. N-acetyle cysteine (NAC) assisted silver sulphide (Ag2S)nanoparticles by in situ reduction technique of silver nitrate (AgNO3) with sodium borohydride (NaBH4)in presence of NAC, where NAC acted as the sulphur donor as well as encapsulating agent. The preparednanoparticles were characterized by transmission electron microscopy, scanning electron microscopy,atomic force microscopy, X-ray diffraction technique and dynamic light scattering technique. Anenhancement was noticed in the current–voltage characteristics, with major reduction in reflectancewhen c-SiNx solar cells were coated with such nanoparticles. Broadband enhancement of externalquantum efficiency (EQE) was also observed.