This paper reports on experimental and theoretical investigations of atypical temperature-dependent photoluminescence properties of multi-stacked InAs quantum dots in close proximity to InGaAs strain-relief underlying quantum well. The InAs/InGaAs/GaAs QD heterostructure was grown by solid-source molecular beam epitaxy (SS-MBE) and investigated via photoluminescence (PL), spectroscopic ellipsom...

The PSCs are prepared under two environments to explore the effect of excessive PbI 2 at initial days, which revealing excess and its evolution in perovskite thin films. • Triple-cation perovskites were glove box atmospheric environment. Defect passivation with days explored. PCE dramatically increase 21.68% 21.89% evolution. triple cation mixed (CsFAMA) known as one most efficient candidates f...

Solar-driven CO2 conversion to precious fossil fuels has been proved become a potential way decrease with producing renewable fuels, which mainly relies on photocatalysts efficient charge separation. In this work, metal free heterostructure of covalent triazine framework (CTF) and graphite carbon nitride (g-C3N4, abbreviated as CN) is applied in the photoreduction for first time. Detailed chara...

Previous reports have studied the impact of sidewall defects on AlGaInP micro light emitting diode (μLED) only by Current-Voltage-Luminescence (I-V-L) measurements. In this work, we propose an alternative approach to investigate these directly after MESA formation, coupling optical characterization techniques together with Time-of-flight secondary ion mass spectrometry (TOF-SIMS) square shaped ...

The optical characteristics of an indirect type II transition in a series of size and shape-controlled linear CdTe/CdSe/CdTe heterostructure nanorods was studied by steady state and time resolved photoluminescence spectra. The energy and lifetime of the photoluminescence from the charge-separated band structure can be tuned by the band edges of the nanorods. Our results show a size-dependent tr...

Herein, 5,5′‐bis(4‐biphenylyl)‐2,2′‐bithiophene (BP2T or PPTTPP) nanocrystals are prepared via a modified miniemulsion technique. X‐ray diffraction and selected area electron analyses reveal that the BP2T molecules stand almost upright against crystal basal plane. With decreasing nanocrystal size, peak energies of photoluminescence (PL) spectra blue‐shifted in photon energy range from bulk to m...

The picosecond carrier dynamics in a closely packed Si-nanodisk (Si-ND) array with ultrathin potential barrier fabricated by neutral beam etching using bio-nano-templates was investigated by time-resolved photoluminescence (PL). The PL decay curves were analyzed as a function of photon energy by the global fitting method. We show three spectral components with different decay times, where the s...

Optical properties and carrier dynamics in type-II Ga(As)Sb/GaAs quantum dots (QDs) embedded in an InGaAs quantum well (QW) are reported. A large blueshift of the photoluminescence (PL) peak is observed with increased excitation densities. This blueshift is due to the Coulomb interaction between physically separated electrons and holes characteristic of the type-II band alignment, along with a ...

We report design strategies for the preparation of highly luminescent Au22(SG)18 clusters, where SG is glutathione, by the functionalization of the cluster shell. In these strategies, the cluster shell was covalently modified with small aromatic molecules and pyrene chromophores that led to a 5-fold PL enhancement by rigidifying the shell-gold. Highly luminescent water-soluble gold clusters wit...

This paper presents the characterization and analysis of a 16.8%-efficient 18 um silicon solar cell on steel substrate. Photoluminescence (PL) is used to monitor the solar cell’s fabrication step by step, and a correlation between PL intensity and implied open circuit voltage is established. PL images yield spatially resolved maps of key electrical parameters such as dark reverse saturation cur...