Qiaoqiang Gan
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View article: From Laboratory to Field: Enhancing Solar Evaporation Performance through Advanced Thermal Management
From Laboratory to Field: Enhancing Solar Evaporation Performance through Advanced Thermal Management Open
Solar evaporation has emerged as a promising off-grid solution for producing potable water from diverse sources. With advanced modular designs, particularly downward evaporation and multistage configurations, remarkable efficiency improvem…
View article: Defect-modulation in α-Ga2O3 molecular beam epitaxial photodetector investigated through pulsed-light persistent-photoconductivity
Defect-modulation in α-Ga2O3 molecular beam epitaxial photodetector investigated through pulsed-light persistent-photoconductivity Open
α-phase gallium oxide (Ga2O3) features a corundum crystal structure that closely matches the low-cost sapphire substrate commonly used in epitaxy, enabling researchers to perform precise and controllable Ga2O3 epitaxy. It thus offers an ex…
View article: Hydroxypropyl Cellulose‐Based Thermochromic Hydrogels for Smart Passive Cooling
Hydroxypropyl Cellulose‐Based Thermochromic Hydrogels for Smart Passive Cooling Open
Solar heating through windows significantly increases thermal loads in buildings, vehicles, and greenhouses. In particular, overheating in parked vehicles under direct sunlight poses serious safety risks, with numerous reports linking high…
View article: Sky cooling for LED streetlights
Sky cooling for LED streetlights Open
Thermal management is a critical challenge for semiconductor light-emitting diodes (LEDs), as inadequate heat dissipation reduces luminous efficiency and shortens the devices’ lifespan. Thus, there is an urgent need for more effective cool…
View article: Passive cooling of greenhouses in extreme climates through spectral control film
Passive cooling of greenhouses in extreme climates through spectral control film Open
A warming climate poses a major threat to agriculture globally, necessitating technological solutions to mitigate frequently occurring extreme heat stress. Greenhouses in hot regions can provide suitable growth environments throughout the …
View article: On the structural and bandgap properties of mist-CVD-grown κ-Ga2O3 post continuous temperature annealing
On the structural and bandgap properties of mist-CVD-grown κ-Ga2O3 post continuous temperature annealing Open
We investigate the continuous annealing of orthorhombic κ-Ga2O3 films on AlN/c-plane sapphire templates grown by Mist Chemical Vapor Deposition (mist-CVD) using in situ high-temperature x-ray diffraction (HT-XRD). Increasing the annealing …
View article: Lubricated Surface in a Vertical Double‐Sided Architecture for Radiative Cooling and Atmospheric Water Harvesting
Lubricated Surface in a Vertical Double‐Sided Architecture for Radiative Cooling and Atmospheric Water Harvesting Open
Radiative cooling significantly lowers condenser temperatures below ambient levels, enabling atmospheric water harvesting (AWH) without additional energy. However, traditional sky‐facing condensers have low cooling power density, and water…
View article: A solar-driven atmospheric water extractor for off-grid freshwater generation and irrigation
A solar-driven atmospheric water extractor for off-grid freshwater generation and irrigation Open
Solar-driven atmospheric water extraction (SAWE) is a sustainable technology for decentralized freshwater supply. However, most SAWE systems produce water intermittently due to the cyclic nature, with adoption hindered by complex design re…
View article: Semiconductor Membrane Exfoliation: Technology and Application
Semiconductor Membrane Exfoliation: Technology and Application Open
Flexible semiconductor film‐based optoelectronic devices have garnered significant attention in emerging fields such as the Internet of Things (IoT), wearable devices, and smart healthcare due to their wide range of applications. It is cha…
View article: Enhanced nighttime power generation and photovoltaic cooling in photovoltaic-thermoelectric hybrid systems
Enhanced nighttime power generation and photovoltaic cooling in photovoltaic-thermoelectric hybrid systems Open
In response to the pervasive challenge of limited access to the electric grid for large global populations, standard photovoltaic (PV) cells offer a renewable off-grid electricity source, albeit restricted to daytime solar irradiance. With…
View article: A robust thin-film droplet-induced electricity generator
A robust thin-film droplet-induced electricity generator Open
The pursuit of cost-effective, high-voltage electricity generators activated by droplets represents a new frontier in hydropower technology. This study presents an economical method for crafting droplet generators using common materials su…
View article: Band alignment of grafted monocrystalline Si (001)/$β$-Ga$_2$O$_3$ (010) p-n heterojunction determined by X-ray photoelectron spectroscopy
Band alignment of grafted monocrystalline Si (001)/$β$-Ga$_2$O$_3$ (010) p-n heterojunction determined by X-ray photoelectron spectroscopy Open
Beta-phase gallium oxide ($β$-Ga$_2$O$_3$) research has gained accelerated pace due to its superiorly large bandgap and commercial availability of large-diameter native substrates. However, the high acceptor activation energy obstructs the…
View article: Beam-controlled spectral-selective architecture with planar polydimethylsiloxane/metal-films for all-day radiative cooling
Beam-controlled spectral-selective architecture with planar polydimethylsiloxane/metal-films for all-day radiative cooling Open
Radiative cooling is a passive cooling strategy with zero consumption of electricity. Although this technology can work well during optimal atmospheric conditions at nighttime, it is essential to achieve efficient radiative cooling during …
View article: Globalization in Photonics Research and Development
Globalization in Photonics Research and Development Open
A brief account of photonics research activities in the selected countries in the Middle East and Africa is presented in this article. Though not comprehensive, we hope to provide a glimpse of the research landscape in the region, and the …
View article: Protecting and Enhancing the Photoelectrocatalytic Performance of InGaN Nanowires toward Nitrogen Reduction to Ammonia Synthesis
Protecting and Enhancing the Photoelectrocatalytic Performance of InGaN Nanowires toward Nitrogen Reduction to Ammonia Synthesis Open
The photoelectrochemical (PEC) reduction of nitrogen (N2) to ammonia (NH3) has emerged as a potential alternative to the conventional Haber–Bosch approach as the solar energy-driven process reduces energy consumption. In this work, PEC N2 …
View article: Ground-facing radiative cooling for high power LED lights
Ground-facing radiative cooling for high power LED lights Open
Objects on Earth facing the sky have the ability to emit thermal energy into the universe through the transparent atmosphere. This process can enable electricity-free cooling due to the extremely low temperature of outer space. However, fa…
View article: Demonstration of a monocrystalline GaAs-$β$-Ga$_2$O$_3$ p-n heterojunction
Demonstration of a monocrystalline GaAs-$β$-Ga$_2$O$_3$ p-n heterojunction Open
In this work, we report the fabrication and characterizations of a monocrystalline GaAs/$β$-Ga$_2$O$_3$ p-n heterojunction by employing semiconductor grafting technology. The heterojunction was created by lifting off and transfer printing …
View article: Initial demonstration of AlGaAs-GaAsP-beta-Ga2O3 n-p-n double heterojunctions
Initial demonstration of AlGaAs-GaAsP-beta-Ga2O3 n-p-n double heterojunctions Open
Beta phase gallium oxides, an ultrawide-bandgap semiconductor, has great potential for future power and RF electronics applications but faces challenges in bipolar device applications due to the lack of p-type dopants. In this work, we dem…
View article: Parasitic Heating of Perovskite‐ and Silicon‐Based Photovoltaics (Adv. Energy Mater. 24/2023)
Parasitic Heating of Perovskite‐ and Silicon‐Based Photovoltaics (Adv. Energy Mater. 24/2023) Open
Cooling Score In article number 2300013, Lujia Xu, Stefaan De Wolf, and co-workers introduce the cooling score (CS) to quantify parasitic heating for photovoltaic technologies. The higher the CS, the cooler the device. Perovskite single-ju…
View article: Optoelectronic devices based on thin single-crystalline semiconductor films and non-epitaxial optical cavities
Optoelectronic devices based on thin single-crystalline semiconductor films and non-epitaxial optical cavities Open
Optoelectronic devices that use very thin single-crystalline inorganic semiconductor films as phonon-absorbing layers in combination with non-lattice optical cavities are provided.
View article: Simultaneous Detection of Tumor Derived Exosomal Protein–MicroRNA Pairs with an Exo-PROS Biosensor for Cancer Diagnosis
Simultaneous Detection of Tumor Derived Exosomal Protein–MicroRNA Pairs with an Exo-PROS Biosensor for Cancer Diagnosis Open
Tumor derived exosomes (TEXs) have emerged as promising biomarkers for cancer liquid biopsy. Conventional methods (such as ELISA and qRT-PCR) and emerging biosensing technologies mainly detect a single type of exosomal biomarker due to the…
View article: Membrane Adsorbents Comprising Self-Assembled Inorganic Nanocages (SINCs) for Super-fast Direct Air Capture Enabled by Passive Cooling
Membrane Adsorbents Comprising Self-Assembled Inorganic Nanocages (SINCs) for Super-fast Direct Air Capture Enabled by Passive Cooling Open
The objectives of the proposed project were to develop highly porous membrane adsorbents comprising CO2-philic polymers and self-assembled inorganic nanocages (SINCs) for rapid temperature swing adsorption using electricity-free solar heat…
View article: Nanostructured Gallium Nitride Membrane at Wafer Scale for Photo(Electro)catalytic Polluted Water Remediation (Adv. Sci. 6/2023)
Nanostructured Gallium Nitride Membrane at Wafer Scale for Photo(Electro)catalytic Polluted Water Remediation (Adv. Sci. 6/2023) Open
Solar‐Driven Wastewater Remediation In article number 2205612 by Boon S. Ooi and co‐workers, a wafer‐scale nanostructured semiconductor membrane is fabricated for photo(electro)catalytic wastewater remediation. Driven by natural sunlight, …
View article: Directly and instantly seeing through random diffusers by self-imaging in scattering speckles
Directly and instantly seeing through random diffusers by self-imaging in scattering speckles Open
Imaging through scattering medium is challenging but important for different applications. Most advances rely on computational image reconstruction from scattering signals. In these conventional investigations, speckles were always treated…
View article: Nanostructured Gallium Nitride Membrane at Wafer Scale for Photo(Electro)catalytic Polluted Water Remediation
Nanostructured Gallium Nitride Membrane at Wafer Scale for Photo(Electro)catalytic Polluted Water Remediation Open
Photo(electro)catalysis methods have drawn significant attention for efficient, energy‐saving, and environmental‐friendly organic contaminant degradation in wastewater. However, conventional oxide‐based powder photocatalysts are limited to…