The solution processibility of perovskites provides a costeffective and high-throughput route for fabricating state-of-the-art solar cells.However,the fast kinetics of precursor-to-perovskite transformation is suscept...The solution processibility of perovskites provides a costeffective and high-throughput route for fabricating state-of-the-art solar cells.However,the fast kinetics of precursor-to-perovskite transformation is susceptible to processing conditions,resulting in an uncontrollable variance in device performance.Here,we demonstrate a supramolecule confined approach to reproducibly fabricate perovskite films with an ultrasmooth,electronically homogeneous surface.The assembly of a calixarene capping layer on precursor surface can induce host-vip interactions with solvent molecules to tailor the desolvation kinetics,and initiate the perovskite crystallization from the sharp molecule-precursor interface.These combined effects significantly reduced the spatial variance and extended the processing window of perovskite films.As a result,the standard efficiency deviations of device-to-device and batch-to-batch devices were reduced from 0.64-0.26%to 0.67-0.23%,respectively.In addition,the perovskite films with ultrasmooth top surfaces exhibited photoluminescence quantum yield>10%and surface recombination velocities<100 cm s^(-1)for both interfaces that yielded p-i-n structured solar cells with power conversion efficiency over 25%.展开更多
Perovskite solar cells provide an economically viable and highly efficient pathway to harness solar energy.However,the instability of the organic component in hybrid perovskites presents a fundamental challenge that c...Perovskite solar cells provide an economically viable and highly efficient pathway to harness solar energy.However,the instability of the organic component in hybrid perovskites presents a fundamental challenge that constrains the longevity and performance of perovskite photovoltaics.In this study,we introduce a molecular deuteration strategy to stabilize FAPbI_(3)perovskite by replacing the active hydrogen in the N–H bond with its heavier isotope,deuterium.The reduced ground-state energy of the isotopic N–D bond induces a deuteration kinetic isotope effect,which significantly decreases the rate constant of the deprotonation reaction from 5.15×10^(−8)to 2.42×10^(−8)s^(−1).Solar cells fabricated using deuterated FAPbI_(3)thin films achieve a power conversion efficiency of 25.08%and exhibit a T97 lifetime of 1264 h under continuous one-sun illumination at 55℃.This approach paves the way for developing inherently stable perovskite materials and extending the operational lifespan of solar cell devices.展开更多
基金financially supported by the National Natural Science Foundation of China(22379044,22472053)the Science and Technology Commission of Shanghai Municipality(23520710700)+6 种基金the Key Program of the National Natural Science Foundation of China(22239001)the Shanghai Pilot Program for Basic Research(22TQ1400100-5)the ShanghaiMunicipal Natural Science Foundation(25ZR1401081)the Fundamental Research Funds for the Central Universities(JKD01251505,JKVD1251041)the Postdoctoral Fellowship Program of CPSF(GZC20250071)the Shanghai Engineering Research Center of Hierarchical Nanomaterials(18DZ2252400)the Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism(Shanghai Municipal Education Commission)。
文摘The solution processibility of perovskites provides a costeffective and high-throughput route for fabricating state-of-the-art solar cells.However,the fast kinetics of precursor-to-perovskite transformation is susceptible to processing conditions,resulting in an uncontrollable variance in device performance.Here,we demonstrate a supramolecule confined approach to reproducibly fabricate perovskite films with an ultrasmooth,electronically homogeneous surface.The assembly of a calixarene capping layer on precursor surface can induce host-vip interactions with solvent molecules to tailor the desolvation kinetics,and initiate the perovskite crystallization from the sharp molecule-precursor interface.These combined effects significantly reduced the spatial variance and extended the processing window of perovskite films.As a result,the standard efficiency deviations of device-to-device and batch-to-batch devices were reduced from 0.64-0.26%to 0.67-0.23%,respectively.In addition,the perovskite films with ultrasmooth top surfaces exhibited photoluminescence quantum yield>10%and surface recombination velocities<100 cm s^(-1)for both interfaces that yielded p-i-n structured solar cells with power conversion efficiency over 25%.
基金financially supported by the National Natural Science Foundation of China(22379044,22472053)Shanghai Pilot Program for Basic Research(22TQ1400100-5)+3 种基金Fundamental Research Funds for the Central Universities(JKD01251505,JKVD1251041)Shanghai Engineering Research Center of Hierarchical Nanomaterials(18DZ2252400)Shanghai Titan Natural Science Development FoundationShanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism(Shanghai Municipal Education Commission)。
文摘Perovskite solar cells provide an economically viable and highly efficient pathway to harness solar energy.However,the instability of the organic component in hybrid perovskites presents a fundamental challenge that constrains the longevity and performance of perovskite photovoltaics.In this study,we introduce a molecular deuteration strategy to stabilize FAPbI_(3)perovskite by replacing the active hydrogen in the N–H bond with its heavier isotope,deuterium.The reduced ground-state energy of the isotopic N–D bond induces a deuteration kinetic isotope effect,which significantly decreases the rate constant of the deprotonation reaction from 5.15×10^(−8)to 2.42×10^(−8)s^(−1).Solar cells fabricated using deuterated FAPbI_(3)thin films achieve a power conversion efficiency of 25.08%and exhibit a T97 lifetime of 1264 h under continuous one-sun illumination at 55℃.This approach paves the way for developing inherently stable perovskite materials and extending the operational lifespan of solar cell devices.
