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HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

HL 76.6: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG

Temperature-Depandent Impedance Spectroscopy of a Transition Metal Oxide Perovskite Heterojunction — Michael Seibt¹, Christian Jooss², Tobias Meyer¹, Birte Kressdorf², and •Mucun Yang¹ — ¹IV. Physical Institute, Uni-Goettingen, Goettingen, Germany — ²Institute of Material Physics, Uni-Goettingen, Goettingen, Germany

Some organic perovskite materials are recently more frequently used for sollar cells because of their high efficiency of photovoltaic behaviours. In this work, capacitance-voltage (C-V) characteristics of $Pr_{0.66}$$Ca_{0.34}$Mn$O_{3}$-Sr$Ti_{0.998}$$Nb_{0.002}$$O_{3}$ perovskite heterojunction is studied by using impedance analyzer, which can calculate the capacitance with the help of impedance spectroscopy. The temperature dependence of C-V measurements is examined in a tmeperature range between 300 K and 40 K. The frequency dependence of capacitance is also observed in the range from $10^{2}$ Hz up to $10^{7}$ Hz under AC condition. In addition, an another factor which might greatly affect the capacitance are the electron's deep level states, which might be partially formed by interface states induced by mismatch of lattice structures at the interface of heterojunction. The deep level states can be charged and discharged only at low frequencies, thus the properties and behaviours of deep level states are investigated under low frequency condition in the range between $10^{2}$ Hz and $10^{3}$ Hz.