1 research outputs found
Quantum Tunneling Effect in CsPbBr<sub>3</sub> Multiple Quantum Wells
Two-dimensional
(2D) lead halide perovskites (LHPs) have garnered
incredible attention thanks to their exciting optoelectronic properties
and intrinsic strong quantum confinement effect. Herein, we carefully
investigate and decipher the charge carrier dynamics at the interface
between CsPbBr3 multiple quantum wells (MQWs) as the photoactive
layer and TiO2 and Spiro-OMeTAD as electron and hole transporting
materials, respectively. The fabricated MQWs comprise three monolayers
of CsPbBr3 separated by 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline
(BCP) as barriers. By varying the BCP thickness, we show that charge
carrier extraction from MQWs to the corresponding extracting layer
occurs through a quantum tunneling effect, as elaborated by steady-state
and time-resolved photoluminescence measurements and further verified
by femtosecond transient absorption experiments. Ultimately, we have
investigated the impact of the barrier-thickness-dependent quantum
tunneling effect on the photoelectric behavior of the synthesized
QW photodetector devices. Our findings shed light on one of the most
promising approaches for efficient carrier extraction in quantum-confined
systems