Perovskite solar cells(PSCs)have made great advances in terms of power conversion efficiency(PCE),yet their subpar stability continues to hinder their commercialization.The interface between the perovskite layer and t...Perovskite solar cells(PSCs)have made great advances in terms of power conversion efficiency(PCE),yet their subpar stability continues to hinder their commercialization.The interface between the perovskite layer and the charge-carrier transporting layers plays a crucial role in undermining the stability of PSCs.In this work,we propose a strategy to stabilize high-performance PSCs with PCE over 23%by introducing a cesium-doped graphene oxide(GO-Cs)as an interlayer between the perovskite and hole-transporting material.The GO-Cs treated PSCs exhibit excellent operational stability with a projected T80(the time where the device PCE reduces to 80%of its initial value)of 2143 h of operation at the maximum powering point under one sun illumination.展开更多
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 m...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 cooling strategies to enhance the energy efficiency of LEDs.LED streetlights,which operate primarily at night and experience high chip temperatures,could benefit greatly from improved thermal management.In this study,we introduce a sky-facing radiative cooling strategy for outdoor LED streetlights,an innovative yet less explored approach for thermal management of optoelectronics.Our method employs a nanoporous polyethylene(nanoPE)material that possesses both infrared transparency and visible reflectivity.This approach enables the direct release of heat generated by the LED through a sky-facing radiative cooling channel,while also reflecting a significant portion of the light back for illumination.By incorporating nanoPE as a cover for sky-facing LED lights,we achieved a remarkable temperature reduction of 7.8°C in controlled laboratory settings and 4.4°C in outdoor environments.These reductions were accompanied by an efficiency improvement of approximately 5%and 4%,respectively.This enhanced efficiency translates into substantial annual energy savings,estimated at 1.9 terawatt-hours when considering the use of LED streetlights in the United States.Furthermore,this electricity saving corresponds to a reduction of approximately 1.3 million metric tons of CO_(2) emissions,equivalent to 0.03%of the total annual CO_(2) emissions by the United States in 2018.展开更多
基金King Abdulaziz City for Science and Technology (KACST) for the fellowshipfunding from the European Union’s Horizon 2020 research and innovation program GRAPHENE Flagship Core 3 under agreement No.: 881603+2 种基金funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sk?odowska-Curie grant agreement No. 945363funding from the Shanghai Pujiang Program (22PJ1401200)the National Natural Science Foundation of China (No. 52302229)
文摘Perovskite solar cells(PSCs)have made great advances in terms of power conversion efficiency(PCE),yet their subpar stability continues to hinder their commercialization.The interface between the perovskite layer and the charge-carrier transporting layers plays a crucial role in undermining the stability of PSCs.In this work,we propose a strategy to stabilize high-performance PSCs with PCE over 23%by introducing a cesium-doped graphene oxide(GO-Cs)as an interlayer between the perovskite and hole-transporting material.The GO-Cs treated PSCs exhibit excellent operational stability with a projected T80(the time where the device PCE reduces to 80%of its initial value)of 2143 h of operation at the maximum powering point under one sun illumination.
基金supported by a baseline from the King Abdullah University of Science and Technology(BAS/1/1415-01)the Carbon Circulate Initiative(REI/1/5218-01)+1 种基金supported by FutureWei’s gift fund to KAUST:radiative cooling and thermal management materials for consumer electronics(GIF/5/5705-01)We appreciate Mr.Lulin Zhang from Shenzhen Senior Technology Material Co.,Ltd.,our industrial partner,for his valuable contribution to fabricating the customized nanoPE film for this study.
文摘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 cooling strategies to enhance the energy efficiency of LEDs.LED streetlights,which operate primarily at night and experience high chip temperatures,could benefit greatly from improved thermal management.In this study,we introduce a sky-facing radiative cooling strategy for outdoor LED streetlights,an innovative yet less explored approach for thermal management of optoelectronics.Our method employs a nanoporous polyethylene(nanoPE)material that possesses both infrared transparency and visible reflectivity.This approach enables the direct release of heat generated by the LED through a sky-facing radiative cooling channel,while also reflecting a significant portion of the light back for illumination.By incorporating nanoPE as a cover for sky-facing LED lights,we achieved a remarkable temperature reduction of 7.8°C in controlled laboratory settings and 4.4°C in outdoor environments.These reductions were accompanied by an efficiency improvement of approximately 5%and 4%,respectively.This enhanced efficiency translates into substantial annual energy savings,estimated at 1.9 terawatt-hours when considering the use of LED streetlights in the United States.Furthermore,this electricity saving corresponds to a reduction of approximately 1.3 million metric tons of CO_(2) emissions,equivalent to 0.03%of the total annual CO_(2) emissions by the United States in 2018.
