首页|Regulation of the quantum barrier and carrier transport toward high-efficiency quasi-2D Dion-Jacobson tin perovskite solar cells

Regulation of the quantum barrier and carrier transport toward high-efficiency quasi-2D Dion-Jacobson tin perovskite solar cells

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Quasi-2D Dion-Jacobson(DJ)tin halide perovskite has attracted much attention due to its elimination of Van der Waals gap and enhanced environmental stability.However,the bulky organic spacers usually form a natural quantum well structure,which brings a large quantum barrier and poor film quality,fur-ther limiting the carrier transport and device performance.Here,we designed three organic spacers with different chain lengths(ethylenediamine(EDA),1,3-propanediamine(PDA),and 1,4-butanediamine(BDA))to investigate the quantum barrier dependence.Theoretical and experimental characterizations indicate that EDA with short chain can reduce the lattice distortion and dielectric confinement effect,which is beneficial to the effective dissociation of excitons and the inhibition of trap-free non-radiative relaxation.In addition,EDA cation shows strong interaction with the inorganic octahedron,realizing large aggregates in precursor solution and high-quality films with improved structural stability.Furthermore,femtosecond transient absorption proves that EDA cations can also weaken the formation of small n-phases with large quantum barrier to achieve effective carrier transport between different n-phases.Finally,the quasi-2D DJ(EDA)FA9Sn10I31 solar cells achieves a 7.07％power conversion efficiency with good environment stability.Therefore,this work sheds light on the regulation of the quantum bar-rier and carrier transport through the chain length of organic spacer for quasi-2D DJ lead-free perovskites.

Chain lengthsOrganic spacersQuantum wellCarrier transportLattice distortion

Huanhuan Yao、Chang Shi、Tai Wu、Shurong Wang、Mingyu Yin、Liming Ding、Yong Hua、Feng Hao

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School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China

College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China

Yunnan Key Laboratory for Micro/Nano Materials & Technology,School of Materials and Energy,Yunnan University,Kunming 650091,Yunnan,China

Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaScience & Technology Department of Sichuan ProvinceRecruitment Program for Young Professionals

2022YFE0118400517020382020YFG0061

2024

10.1016/j.jechem.2024.03.044

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)