Rafique A. Lakho
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Rafique A. Lakho has a total of 10 co-authors. Here are the top co-authors by number of shared publications:
- Adriana Grandolfo
Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy
1 shared publication - Chiara Ingrosso
Institute for Chemical and Physical Processes, CNR-IPCF Bari Division, Chemistry Department, University of Bari, Via E. Orabona 4, 70126 Bari, Italy
1 shared publication - Elisabetta Fanizza
Institute for Chemical and Physical Processes, Italian National Research Council, Bari, Italy
1 shared publication - Giuseppe Valerio Bianco
Institute of Nanotechnology, CNR-NANOTEC, Chemistry Department, University of Bari, Via E. Orabona 4, 70126 Bari, Italy
1 shared publication - Ju Y. Shang
Program of Materials Science, University of California San Diego, La Jolla, CA 92093, USA
1 shared publication - Maria Lucia Curri
Institute for Chemical and Physical Processes, Italian National Research Council, Bari, Italy
1 shared publication
Latest Publications
- Open Access
Electronically Coupled Heterojunctions Based on Graphene and Cu2−xS Nanocrystals: The Effect of the Surface Ligand
Optoelectronic devices combining single-layer graphene (SLG) and colloidal semiconducting nanocrystal (NC) heterojunctions have recently gained significant attention as efficient hybrid photodetectors. While most research has concentrated on systems using heavy metal-based semiconductor NCs, there is a need for further exploration of environmentally friendly nanomaterials, such as Cu2−xS. Chemical ligands play a crucial role in these hybrid photodetectors, as they enable charge transfer between the NCs and SLG. This study investigates the photoresponse of an SLG/Cu2−xS NCs heterojunction, comparing the effect of two short molecules—tetrabutylammonium iodide (TBAI) and 3,4-dimethylbenzenethiol (DMBT)—as surface ligands on the resulting structures. We have analysed charge transfer at the heterojunctions between SLG and the Cu2−xS NCs before and after modification with TBAI and DMBT using Raman spectroscopy and transconductance measurements under thermal equilibrium. The photoresponse of two hybrid devices based on three layers of Cu2₋xS NCs, deposited in one case on SLG/Cu2−xS/TBAI (“TBAI-only” device) and in the other on SLG/Cu2−xS/DMBT (“DMBT + TBAI” device), with a TBAI treatment applied, for both, after each layer deposition, has been evaluated under 450 nm laser diode illumination. The results indicate that the TBAI-only device exhibited a significant increase in photocurrent (4 μA), with high responsivity (40 mA/W) and fast response times (<1 s), while the DMBT + TBAI device had lower photocurrent (0.2 μA) and responsivity (2.4 μA), despite similar response speeds. The difference is attributed to DMBT’s π–π interactions with SLG, which enhances electronic coupling but reduces SLG’s mobility and responsivity.
Open AccessElectronically Coupled Heterojunctions Based on Graphene and Cu2−xS Nanocrystals: The Effect of the Surface Ligand
Optoelectronic devices combining single-layer graphene (SLG) and colloidal semiconducting nanocrystal (NC) heterojunctions have recently gained significant attention as efficient hybrid photodetectors. While most research has concentrated on systems using heavy metal-based semiconductor NCs, there is a need for further exploration of environmentally friendly nanomaterials, such as Cu2−xS. Chemical ligands play a crucial role in these hybrid photodetectors, as they enable charge transfer between the NCs and SLG. This study investigates the photoresponse of an SLG/Cu2−xS NCs heterojunction, comparing the effect of two short molecules—tetrabutylammonium iodide (TBAI) and 3,4-dimethylbenzenethiol (DMBT)—as surface ligands on the resulting structures. We have analysed charge transfer at the heterojunctions between SLG and the Cu2−xS NCs before and after modification with TBAI and DMBT using Raman spectroscopy and transconductance measurements under thermal equilibrium. The photoresponse of two hybrid devices based on three layers of Cu2₋xS NCs, deposited in one case on SLG/Cu2−xS/TBAI (“TBAI-only” device) and in the other on SLG/Cu2−xS/DMBT (“DMBT + TBAI” device), with a TBAI treatment applied, for both, after each layer deposition, has been evaluated under 450 nm laser diode illumination. The results indicate that the TBAI-only device exhibited a significant increase in photocurrent (4 μA), with high responsivity (40 mA/W) and fast response times (<1 s), while the DMBT + TBAI device had lower photocurrent (0.2 μA) and responsivity (2.4 μA), despite similar response speeds. The difference is attributed to DMBT’s π–π interactions with SLG, which enhances electronic coupling but reduces SLG’s mobility and responsivity.