Suk‐Ho Choi

In recent years, graphene quantum dots (GQDs) have been recognized as an attractive building block for electronic, photonic, and bio-molecular device applications. This paper reports the current status of studies on the novel properties of GQDs and their hybrids with conventional and low-dimensional materials for device applications. In this review, more emphasis is placed on the structural, electronic, and optical properties of GQDs, and device structures based on the combination of GQDs with v

Graphene transparent conductive electrodes are highly attractive for photodetector (PD) applications due to their excellent electrical and optical properties. The emergence of graphene/semiconductor hybrid heterostructures provides a platform useful for fabricating high-performance optoelectronic devices, thereby overcoming the inherent limitations of graphene. Here, we review the studies of PDs based on graphene/semiconductor hybrid heterostructures, including device physics/design, performance

Reversible charging effects are observed in metal–insulator–semiconductor structures which have been ion implanted and annealed to produce Si nanocrystals in the insulating SiO2 layer. The shifts in current–voltage (I–V) and capacitance–voltage (C–V) curves are induced by forward constant voltage stress or UV light exposure, and can be explained by hole charging of the nanocrystals in the insulator layer. A reverse constant voltage stress is shown to recover the original I–V curve and partially

Abstract Although 2D|3D has shown potential for application in multifunctional devices, the principle of operation for multifunction devices (SOLAR Cell‐LED: SOLED) has not yet been revealed. However, most studies have reported that the devices have only one auspicious characteristic. Here in this study the SOLED devices are monitored and investigated in a 2D|3D heterostructure with a multidimensional perovskite. It is fond that a 2D|3D heterostructure with a multidimensional perovskite interfac

It is necessary to develop semitransparent photovoltaic cell for increasing the energy density from sunlight, useful for harvesting solar energy through the windows and roofs of buildings and vehicles. Current semitransparent photovoltaics are mostly based on Si, but it is difficult to adjust the color transmitted through Si cells intrinsically for enhancing the visual comfort for human. Recent intensive studies on translucent polymer- and perovskite-based photovoltaic cells offer considerable o

Hybrid organic-inorganic perovskites and MoS₂ are highly attractive as emerging materials for various kinds of optoelectronic devices. Here, we first report perovskite photodiode-solar cell nanosystems (PPSNs) by employing bilayer (BL) MoS₂ and triethylenetetramine-doped graphene (TETA-GR) as the electron-transport layer (ETL) and transparent conductive electrode (TCE), respectively. The rigid/flexible PPSNs exhibit 0.42/0.40 AW^-1 responsivity (<i>R</i>), 37.2/80

We first report p-i-n-type perovskite solar cells (PSCs) using graphene quantum dots (GQDs) hole transport layer (HTL) and graphene transparent conductive electrode codoped with gold nanoparticles and bis(trifluoromethanesulfonyl)amide. The PSCs on rigid glass substrates show maximum power conversion efficiency (PCE) of 17.02/17.15% for forward/reverse scans, comparable to those (17.53/17.55%) of the control cells with poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) HTL. As 30 d elapsed in N2 atmos

The co-doping of graphene with Au nanoparticles and bis(trifluoromethanesulfonyl)-amide is employed for the first time to enhance the performance of graphene/porous Si solar cells.