This study introduces a multifunctional coordination approach to enhance wide bandgap(WBG)tin(Sn)perovskite solar cells(PSCs)by incorporating a natu-rally derived Vitamin H(Biotin)complex into the perovskite precursor...This study introduces a multifunctional coordination approach to enhance wide bandgap(WBG)tin(Sn)perovskite solar cells(PSCs)by incorporating a natu-rally derived Vitamin H(Biotin)complex into the perovskite precursor.The Bio-tin complex exhibits strong chemical interaction with Sn^(2+)via its ureido ring(C= O,-NH),valeric acid chain(-COO^(-)),and tetrahydrothiophene(S C)functionalities.This multidentate interaction further helps to regulate crystal growth kinetics,resulting in compact,pinhole-free films with enhanced surface homogeneity.Furthermore,Biotin effectively passivates uncoordinated Sn sites,mitigates Sn^(2+)oxidation,and suppresses antisite defects,thereby reducing non-radiative recombination and ion migration.As a result,the optimized device demonstrates a record-high power conversion efficiency of 12.8%(independently certified at 12.5%)and an open-circuit voltage(V_(oc))of 1.03 V for WBG Sn PSCs.Notably,the device exhibits outstanding ambient stability,retaining almost 80%of its initial efficiency after 1460 h of storage without encapsulation,highlighting the potential of the Biotin complex for high-performance and durable lead-free perovskite photovoltaics.展开更多
Tin (Sn)-based halide perovskite solar cells (PSCs) offer a promising lead-free alternative with favorable bandgaps and strong absorption, yet their performance is limited by substantial open-circuit voltage (V_(oc)) ...Tin (Sn)-based halide perovskite solar cells (PSCs) offer a promising lead-free alternative with favorable bandgaps and strong absorption, yet their performance is limited by substantial open-circuit voltage (V_(oc)) and fill factor (FF) losses. This review examines the primary origins of V_(loss), mainly non-radiative recombination associated with undercoordinated Sn sites, deep-level defects, and the oxidation of Sn^(2+), all of which elevate defect densities and accelerate recombination. FF degradation is further linked to Shockley–Read–Hall (SRH) trap-assisted recombination, reflected in increased ideality factors. The review also highlights advanced characterization approaches thermal admittance spectroscopy, drive-level capacitance profiling, and emerging machine-learning tools for probing carrier dynamics and quantifying non-radiative pathways. Although progress has been made, matching the V_(oc) and FF of Pb-based PSCs remains challenging due to the intertwined effects of oxidation chemistry, defect physics, and interfacial energetics. Recent strategies, such as molecular coordination, surface passivation, compositional engineering, and optimized charge-transport interlayers, show promise in suppressing recombination and improving energy alignment. Continued advances in defect passivation, oxidation control, and interface engineering are expected to be key to enabling efficient and environmentally sustainable Sn-based photovoltaic technologies.展开更多
基金National Research Foundation of Korea,Grant/Award Numbers:NRF-RS-2023-00217270,RS-2023-00212744,RS-2024-00436187KETEP,Grant/Award Number:RS-2023-00236664。
文摘This study introduces a multifunctional coordination approach to enhance wide bandgap(WBG)tin(Sn)perovskite solar cells(PSCs)by incorporating a natu-rally derived Vitamin H(Biotin)complex into the perovskite precursor.The Bio-tin complex exhibits strong chemical interaction with Sn^(2+)via its ureido ring(C= O,-NH),valeric acid chain(-COO^(-)),and tetrahydrothiophene(S C)functionalities.This multidentate interaction further helps to regulate crystal growth kinetics,resulting in compact,pinhole-free films with enhanced surface homogeneity.Furthermore,Biotin effectively passivates uncoordinated Sn sites,mitigates Sn^(2+)oxidation,and suppresses antisite defects,thereby reducing non-radiative recombination and ion migration.As a result,the optimized device demonstrates a record-high power conversion efficiency of 12.8%(independently certified at 12.5%)and an open-circuit voltage(V_(oc))of 1.03 V for WBG Sn PSCs.Notably,the device exhibits outstanding ambient stability,retaining almost 80%of its initial efficiency after 1460 h of storage without encapsulation,highlighting the potential of the Biotin complex for high-performance and durable lead-free perovskite photovoltaics.
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(NRF-RS-2023-00212744,RS-2023-00217270,RS-2024-00436187)Moreover,this work was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP)and the Ministry of Trade,Industry&Energy(MOTIE)of the Republic of Korea(No.RS-2023-00236664).
文摘Tin (Sn)-based halide perovskite solar cells (PSCs) offer a promising lead-free alternative with favorable bandgaps and strong absorption, yet their performance is limited by substantial open-circuit voltage (V_(oc)) and fill factor (FF) losses. This review examines the primary origins of V_(loss), mainly non-radiative recombination associated with undercoordinated Sn sites, deep-level defects, and the oxidation of Sn^(2+), all of which elevate defect densities and accelerate recombination. FF degradation is further linked to Shockley–Read–Hall (SRH) trap-assisted recombination, reflected in increased ideality factors. The review also highlights advanced characterization approaches thermal admittance spectroscopy, drive-level capacitance profiling, and emerging machine-learning tools for probing carrier dynamics and quantifying non-radiative pathways. Although progress has been made, matching the V_(oc) and FF of Pb-based PSCs remains challenging due to the intertwined effects of oxidation chemistry, defect physics, and interfacial energetics. Recent strategies, such as molecular coordination, surface passivation, compositional engineering, and optimized charge-transport interlayers, show promise in suppressing recombination and improving energy alignment. Continued advances in defect passivation, oxidation control, and interface engineering are expected to be key to enabling efficient and environmentally sustainable Sn-based photovoltaic technologies.
