A universal close-space annealing strategy towards high-quality perovskite absorbers enabling efficient all-perovskite tandem solar cells. Nature Energy.
Comprehensive multidimensional opto-electro-thermal (OET) modeling of a radiative cooling system for solar cells (SCs) and the effect of temperature on the performance of SCs.
We propose a colored
radiative cooler assisted by optical Tamm
resonance, which features the high-performance cooling effect and
high-purity subtractive primary colors (CMY) simultaneously. By developing
the design method and evaluation methodology for the colored radiative
cooler, we accurately balance the conflict between the cooling effect
and the color displaying. Compared with our designed conventional
radiative cooler, the thermal emissivity of the colored radiative
cooler in the atmospheric transparent window is remarkably enhanced
after introducing the desired colors; moreover, only a steady-state
temperature of ∼30% is sacrificed to enable the color displaying.
Our results demonstrate that the cooling power densities of the radiative
coolers with three subtractive primary colors at ambient temperature
can reach about 44–52 W/m2, with their temperatures
being reduced by 5–6 °C when h
c = 6 W/m2/K. In addition, we also numerically analyze
the angular performance and the effect of environmental situations
on the cooling performance. The proposed colored radiative coolers
show the potential applications in the temperature-sensitive electronic/optoelectronic
devices and personal thermal management fields.
To realize reliably high efficiency of perovskite solar cells (PSCs), material synthesis, interface manipulation, and device realization have been widely studied. Nevertheless, deeply understanding the fundamental optics and physics which regulate the multi-domain optoelectronic responses is crucial. Here, the authors present an optoelectronic study of PSCs under various configurations. It combines electromagnetic response and carrier electrodynamics inside PSCs so that the microscopic response in frequency/spatial domains and the device output can be obtained. The effects of perovskite doping type/concentration/thickness and doping concentrations of electron (hole) transport layer (i.e., ETL [HTL]) on the optoelectronic response of the complete, free-HTL, and free-ETL PSCs are studied. The energy diagrams addressing the band bending, the built-in electrical field addressing the carrier separation, and the surface/bulk recombination addressing the current losses are analyzed. It is found that the doping type of perovskite greatly affects the cell performance, for example, for ETL-side illumination, pperovskite enables higher efficiency than n-doping due to a much reduced bulk recombination. Achieving good agreements with existing experiments, the model is used for the design of PSCs. It shows that the photoconversion efficiencies of complete, free-HTL, and free-ETL PSCs can be enhanced from 16.6%, 10.7%, and 13.3% to 19.0%, 15.9%, and 18.5%, respectively.
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