Thermophotovoltaic cells with integrated air-bridge for improved efficiency

Nanophotonics

We present a radiative cooling material capable of enhancing albedo while reducing ground surface temperatures beneath fielded bifacial solar panels. Electrospinning a layer of polyacrylonitrile nanofibers, or nanoPAN, onto a polymer-coated silver mirror yields a total solar reflectance of 99 %, an albedo of 0.96, and a thermal emittance of 0.80. The combination of high albedo and high emittance is enabled by wavelength-selective scattering induced by the hierarchical morphology of nanoPAN, which includes both thin fibers and bead-like structures. During outdoor testing, the material outperforms the radiative cooling power of a state-of-the-art control by ∼20 W/m2 and boosts the photocurrent produced by a commercial silicon cell by up to 6.4 mA/cm2 compared to sand. These experiments validate essential characteristics of a high-albedo radiative-cooling reflector with promising potential applications in …

Organic photovoltaic cells (OPVs) and their compositions are described herein. one or more embodiments, the acceptor with an active layer of an OPV includes is a non-fullerene acceptor. Such non-fullerene acceptors may provide improved OPV performance characteristics such as improved power conversion efficiency, open circuit voltage, fill factor, short circuit current, and/or external quantum efficiency.

Disclosed herein are organic photosensitive devices including at least one exciton-blocking charge carrier filter. The filters comprise a mixture of at least one wide energy gap material and at least one electron or hole conducting material. As described herein, the novel filters simultaneously block excitons and conduct the desired charge carrier (electrons or holes).

PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12= CC= CC= C2C2= CC= CC= C2C1= NOC (= O) NC1= CC= CC2= CC= CC= C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 1

STTGYIUESPWXOW-UHFFFAOYSA-N 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline Chemical compound C= 12C= CC3= C (C= 4C= CC= CC= 4) C= C (C) N= C3C2= NC (C)= CC= 1C1= CC= CC= C1 STTGYIUESPWXOW-UHFFFAOYSA-N 0.000 description 14

Nature

Phosphorescent organic light-emitting diodes (PHOLEDs) feature high efficiency,, brightness and colour tunability suitable for both display and lighting applications. However, overcoming the short operational lifetime of blue PHOLEDs remains one of the most challenging high-value problems in the field of organic electronics. Their short lifetimes originate from the annihilation of high-energy, long-lived blue triplets that leads to molecular dissociation, , –. The Purcell effect, the enhancement of the radiative decay rate in a microcavity, can reduce the triplet density and, hence, the probability of destructive high-energy triplet–polaron annihilation (TPA), and triplet–triplet annihilation (TTA) events,,,. Here we introduce the polariton-enhanced Purcell effect in blue PHOLEDs. We find that plasmon–exciton polaritons (PEPs) substantially increase the strength of the Purcell effect and achieve an average Purcell factor (PF) of …

Matter

Small-molecule-based Lewis base additives have been explored as defect passivators to improve the thermal stability of perovskites. However, the high diffusivity and low molecular weight (Mw) of these additives, along with their low coordination numbers (Nc < 5) with perovskites, often fall short in efficiently stabilizing perovskites under thermal stress. Here, we design and synthesize a set of small molecular passivators with controllable Nc (2–15) and Mw (222.3 g/mol ∼2071.6 g/mol). We systemically investigated how the Nc, Mw, and molecular configuration of the additives impact the morphological and optoelectronic properties and thermal stability of Cs0.05(FA0.85MA0.15)0.95Pb(I0.85Br0.15)3 perovskite thin films. We find that higher Nc and Mw, when accompanied by a large structural hindrance, can simultaneously improve the grain size and defect passivation, thereby improving the overall optoelectronic …

H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereofH01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices

H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereofH01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices

A method for fabricating an organic electronic device comprises providing a plurality of photoresist structures on a substrate, the substrate having a first electrode layer, the photoresist structures having a bottom surface attached to the substrate and a top surface opposite the bottom surface, the top surface having a dimension greater than a dimension of the bottom surface, positioning a mask over the structures, the mask having a plurality of openings, and depositing an emissive material over the substrate through at least one of the plurality of openings to form at least one emissive element. An organic electronic device and a method of fabricating an organic electronic component are also described.

A thermal management system has a high temperature heat transfer circuit and a low temperature heat transfer circuit for modulating the temperature of heat-generating components having different operating temperatures. The heat transfer circuits are in flow communication and are interdependent so that a single circulating pump can be used to pump a liquid heat transfer medium through both circuits. One of the heat transfer circuits comprises a continuous loop and the other heat transfer circuit comprises an open loop having a first end and a second end at which it is in flow communication with the first heat transfer circuit. Each heat transfer circuit is provided with a heat exchanger to modulate temperature of the heat transfer medium.

An optoelectronic system comprising a flexible optoelectronic device, wherein the device comprises a flexible plastic substrate, a coating comprising a glass or a polymer, positioned over the flexible plastic substrate, an anode and a cathode positioned over the coating, an organic heterojunction positioned between the anode and the cathode, comprising a donor material and an acceptor material, and an encapsulating layer comprising a glass or a polymer, positioned over the anode and the cathode. The device further comprises a roller configured to roll the flexible optoelectronic device into a stored position and a frame configured to mount the roller and the optoelectronic device.

Introduction Cannulation of patients for veno-venous extracorporeal membrane oxygenation Veno Venous (VV-ECMO) who are not intubated and are spontaneously breathing—“awake” ECMO—has emerged as an attractive approach to the management of severe respiratory failure. This approach may minimize sedation requirements, mitigate risks of induction and intubation, limit ventilator induced lung injury, and promote mobilization. In this study we explored the incidence and outcomes for “awake” VVECMO cannulation using the large, multicenter ELSO Registry. Methods Patients in the ELSO registry (2019-2022) who were cannulated for VV-ECMO were included. Patients were identified as cannulated “awake” if they were not indicated as receiving mechanical ventilation at the time of ECMO cannulation. Descriptive statistics were used to describe the study population. Propensity matching based on age, sex …

Nature

Phosphorescent organic light-emitting diodes (PHOLEDs) feature high efficiency,, brightness and colour tunability suitable for both display and lighting applications. However, overcoming the short operational lifetime of blue PHOLEDs remains one of the most challenging high-value problems in the field of organic electronics. Their short lifetimes originate from the annihilation of high-energy, long-lived blue triplets that leads to molecular dissociation, , –. The Purcell effect, the enhancement of the radiative decay rate in a microcavity, can reduce the triplet density and, hence, the probability of destructive high-energy triplet–polaron annihilation (TPA), and triplet–triplet annihilation (TTA) events,,,. Here we introduce the polariton-enhanced Purcell effect in blue PHOLEDs. We find that plasmon–exciton polaritons (PEPs) substantially increase the strength of the Purcell effect and achieve an average Purcell factor (PF) of …

Bulletin of the American Physical Society

D33. 00009: Theory of Purcell effect enhancement on the operational lifetime of phosphorescent organic light-emitting devices*