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On the Origin of Below-Bandgap Turn-On Voltage in LEDs and High VOC in Solar Cells comprising Colloidal Quantum Dots with Engineered Density of States
Santanu Pradhan, Mariona Dalmases, Gerasimos Konstantatos
The turn-on voltage of an LED is an important parameter as it determined the power consumption of the LED and influences the effective power conversion efficiency.
Solution Processed Infrared- and Thermo- Photovoltaics based on 0.7 eV Bandgap PbS Colloidal Quantum Dots
Yu Bi, Arnau Bertran, Shuchi Gupta +6
Harnessing low energy photons is of paramount importance for multi-junction high efficiency solar cells as well as for thermo-photovoltaic applications. However, semiconductor abso…
Single-Exciton Gain and Stimulated Emission Across the Infrared Optical Telecom Band from Robust Heavily-doped PbS Colloidal Quantum Dots
Sotirios Christodoulou, Iñigo Ramiro, Andreas Othonos +6
Materials with optical gain in the infrared are of paramount importance for optical communications, medical diagnostics1 and silicon photonics2,3 . The current technology is based…
Recent Progress and Future Prospects of 2D-based Photodetectors
Nengjie Huo, Gerasimos Konstantatos
Conventional semiconductors such as silicon and InGaAs based photodetectors have encountered a bottleneck in modern electronics and photonics in terms of spectral coverage, low res…
Colloidal Quantum Dot Tandem Solar Cells Using CVD Graphene as An Atomically Thin Intermediate Recombination Layer
Yu Bi, Santanu Pradhan, Mehmet Zafer Akgul +4
Two-terminal tandem cell architectures are believed to be an effective way to further improve the power conversion efficiency in solution processed photovoltaics. To design an effi…
Engineering Vacancies in Bi2S3 yields sub-Bandgap Photoresponse and highly sensitive Short-Wave Infrared Photodetectors
Nengjie Huo, Alberto Figueroba, Yujue Yang +4
Defects play an important role in tailoring the optoelectronic properties of materials. Here we demonstrate that sulphur vacancies are able to engineer sub-band photoresponse into…
High-Efficiency Light-Emitting Diodes based on Formamidinium lead bromide nanocrystals and solution processed transport layers
Francesco Di Stasio, Inigo Ramiro, Yu Bi +3
Perovskite nanocrystal light-emitting diodes (LEDs) employing architecture comprising a ZnO nanoparticles electron-transport layer and a conjugated polymer hole-transport layer hav…
High Open Circuit voltage solar cells based on bright mixed halide CsPbBrI2 perovskite nanocrystals synthesized under ambient air conditions
Sotirios Christodoulou, Francesco Di Stasio, Santanu Pradhan +2
Lead halide perovskite nanocrystals (NCs) are currently emerging as one of the most interesting solution processed semiconductors since they possess high photoluminescence quantum…