Persistent operation inevitably elevates the temperature of perovskite solar cells(PSCs),posing a challenge for maximizing their power output and stability even after effective defect passivation and encapsulation tec...Persistent operation inevitably elevates the temperature of perovskite solar cells(PSCs),posing a challenge for maximizing their power output and stability even after effective defect passivation and encapsulation techniques have been implemented.Regulating the thermal conductivity of halide perovskites by additive engineering is now a mainstream strategy for achieving self-cooling devices,but our fundamental understanding of how perovskites with atomic disorder function remains insufficient.This theoretical study unveils the underlying mechanism of facet-dependent thermodynamic properties in mixed-cation perovskites.The results demonstrate that the(100)facet has higher thermal conductivity than the(110)and(111)facets.By carefully controlling the(100)crystallographic orientation through buried and bulk modification,the thermal conductivity of the target perovskite film can be increased from 1.005 to 1.068 W m^(-1)K^(-1),which lowers the PSC's equilibrium temperature 5.25℃by accelerating heat transport and dissipation.Consequently,we achieve an inverted PSC with an excellent efficiency of 25.12%,accompanied by a significantly reduced temperature coefficient and better long-term stability:a conservation rate exceeding 90%after aging at 85℃and exposure to persistent light irradiation for 1100 h.This work elucidates a previously unidentified outcome of crystal facet engineering:the achievement of thermal management in high-performance PSCs.展开更多
基金financial support provided by the National Natural Science Foundation of China(62374105,22179051,62304124,62204098)Special Fund of Taishan Scholar Program of Shandong Province(tsqnz20221141)+5 种基金Yunnan Provincial Science and Technology Project at Southwest United Graduate School(202302A0370009)the Key Applied Basic Research Program of Yunnan Province(202201AS070023)the Spring City Plan:the High-level Talent Promotion and Training Project of Kunming(2022SCP005)Project for Building a Science and Technology Innovation Center Facing South Asia and Southeast Asia(202403AP140015)Foundation of Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University(OF2022-01)Yunnan Revitalization Talent Support Program.
文摘Persistent operation inevitably elevates the temperature of perovskite solar cells(PSCs),posing a challenge for maximizing their power output and stability even after effective defect passivation and encapsulation techniques have been implemented.Regulating the thermal conductivity of halide perovskites by additive engineering is now a mainstream strategy for achieving self-cooling devices,but our fundamental understanding of how perovskites with atomic disorder function remains insufficient.This theoretical study unveils the underlying mechanism of facet-dependent thermodynamic properties in mixed-cation perovskites.The results demonstrate that the(100)facet has higher thermal conductivity than the(110)and(111)facets.By carefully controlling the(100)crystallographic orientation through buried and bulk modification,the thermal conductivity of the target perovskite film can be increased from 1.005 to 1.068 W m^(-1)K^(-1),which lowers the PSC's equilibrium temperature 5.25℃by accelerating heat transport and dissipation.Consequently,we achieve an inverted PSC with an excellent efficiency of 25.12%,accompanied by a significantly reduced temperature coefficient and better long-term stability:a conservation rate exceeding 90%after aging at 85℃and exposure to persistent light irradiation for 1100 h.This work elucidates a previously unidentified outcome of crystal facet engineering:the achievement of thermal management in high-performance PSCs.
