Jeremy A. Rowlette,1,2,* Rohan D. Kekatpure,1,3 Matt A. Panzer,2 Mark L. Brongersma,3 and Kenneth E. Goodson2 1Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA 2Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA 3Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA ...

On the surface and grain boundary of perovskite films there are large quantities defects, which leads to photogenerated carrier nonradiative recombination degrades performance solar cells (PSCs). Surface passivation can suppress detrimental effects defect improve PSCs. Here, an organic molecule, 4-chloro-1,8-naphthalic anhydride (ALS), is adopted passivate defects on (FAPbI3)0.95(MAPbBr3)0.05 f...

Development of tin (Sn)-based perovskite solar cells (PSCs) largely lags behind that lead counterparts due to fast crystallization process Sn and numerous defects in both bulk surface films. Herein, this work reports a facile strategy introducing 4-fluorobenzylammonium iodide (FBZAI) as additives into precursor synergistically modulate the roles benzylamine fluorine Sn-based PSCs. Incorporation...

In this work, we present the characterization of red InGaN/GaN multiple-quantum-well (MQW) light-emitting diode structures. The optical properties two MQW structures with different n-GaN underlayer thicknesses (4 and 8 μm) are studied compared. results photoluminescence studies show that a thicker layer is beneficial for obtaining higher content MQWs. However, sample has poorer internal quantum...

Point defects in semiconductor crystals provide a means for carriers to recombine nonradiatively. This recombination process impacts the performance of devices. We present Nonrad code that implements first-principles approach Alkauskas et al. (2014) [8] evaluation nonradiative capture coefficients based on quantum-mechanical description process. An evaluating electron-phonon coupling within pro...

Developing an innovative "Test Paper" based on virgin nanoporous silicon (NPSi) which shows intense visible emission and excellent fluorescence stability. The visual fluorescence quenching "Test Paper" was highly selective and sensitive recognizing Cu2+ at μmol/L level. Within the concentration range of 5 × 10-7 ~50 × 10-7mol/L, the linear regression equation of IPL = 1226.3-13.6[CCu2+] (R = 0....

We report photoluminescence studies on some GaInAsIAIGaInAs superlattices lattice matched to InP. An electric field was applied along the growth axis. The spectra recorded at temperatures between 10 K and 300 K, present only one peak, the energy of which does not vary with the strength of the electric field. Moreover, the intensity of the peak does not monotonely vary with the temperature. Thes...

We investigate the effects of both nonradiative recombination centers and compositional inhomogeneity on low-temperature localization in GaInNAs quantum wells. With the introduction of antimony and a reduction of nitrogen plasma-related damage during growth, localization energies as low as 2.5 meV are reported for single quantum well samples with room temperature emission at 1.5 mm. Moreover, l...

Perovskite/Si tandem solar cells have the potential to considerably out-perform conventional solar cells. Under standard test conditions, perovskite/Si tandem solar cells already outperform the Si single junction. Under realistic conditions, however, as we show, tandem solar cells made from current record cells are hardly more efficient than the Si cell alone. We model the performance of realis...

The strong light emission and absorption exhibited by single atomic layer transitional metal dichalcogenides in the visible to near-infrared wavelength range make them attractive for optoelectronic applications. In this work, using two-pulse photovoltage correlation technique, we show that monolayer molybdenum disulfide photodetector can have intrinsic response times as short as 3 ps implying p...