Two-dimensional quantum dots for highly efficient heterojunction solar cells

Top-Down Fabrication of Luminescent Graphene Quantum Dots Using Self-Assembled Au Nanoparticles

“…This fabrication method also has some challenges. The luminescent properties of GQDs can be tuned by adding a functional group to the edge. − However, the functionalization is limited to an etching-based top-down approach. Postannealing in a reactive atmosphere like post-thermal reduction in this study can be a countermeasure to relieve the limitation.…”

“…Graphene quantum dots (GQDs) are mono- or few-layer graphene with a lateral dimension less than 100 nm. , The quantum confinement effect in GQDs opens a finite band gap and provides to graphene several intriguing optical, thermal, mechanical, and electrical properties including fluorescence. ,− Fluorescent GQDs with photostability, low toxicity, and biocompatibility have several potential applications such as bioimaging, , drug delivery, , photodynamic therapy, photodetectors, − light-emitting diodes, − solar cells, − fuel cells, , etc. Choosing a relevant synthesis method is critical for using GQDs in a desired application as the physical and chemical properties of GQDs are sensitive to their size, doping, defects, atomic edge structure, and surface functionalization, − which are affected by the fabrication methods. Recent theoretical studies have predicted that the energy gap and edge states of GQDs depend on passivation , and doping .…”

“…For example, the engineered GQD-based type-II heterostructures are beneficial for solar cell applications. 25 Recently, a number of GQD synthesis methods have been reported, which can be categorized into two groups in a conventional manner: bottom-up and top-down methods. 2,22 Bottom-up methods synthesize GQDs from carbon-containing small precursors.…”

“…Choosing a relevant synthesis method is critical for using GQDs in a desired application as the physical and chemical properties of GQDs are sensitive to their size, doping, defects, atomic edge structure, and surface functionalization, − which are affected by the fabrication methods. Recent theoretical studies have predicted that the energy gap and edge states of GQDs depend on passivation , and doping . Oxygen passivation can effectively decrease the energy gap in GQDs, and quantum dot shape, edge termination, and functional groups can influence their dipole moments .…”

Two-dimensional IV–VA3 monolayers with enhanced charge mobility for high-performance solar cells

“…S12(b) (ESI†). The PCEs of the SiP 3 -, SiAs 3 - and GeAs 3 -based single-junction PVs and other existing 2D heterojunction SCs were compared (Table S4, (ESI†) including BTPV-4F/PTB7-Th tandem SC (16.4%), 55 n -CdS/p-Si heterojunction SC (18.72%), 56 CH 3 NH 3 PbI 3 SC (21%), 57 α-AsP/GaN SC (22.1%), 36 MoSe 2 /Ψ-phosphorene SC (20.26%), 58 TiNF/TiNCl SC (22%), 59 Ti 3 C 2 T x -based silicon heterojunction SCs (20%), 60 functionalized silicene/graphene SC (23.34%), 61 Te/WTe 2 SC (22.5%), 62 Te/MoTe 2 heterojunction SC (20.1%), 62 α-Sb 2 TeSe 2 /HfSe 2 (22.5%) and β-Sb 2 TeSe 2 /BiOI SCs (20.3%). 63 Therefore, the proposed SiP 3 -, SiAs 3 - and GeAs 3 -based heterojunctions SCs are comparable with existing 2D heterojunction SCs.…”