Fig. 2: Momentum conservation facilitates hot-carrier transitions. | Nature Communications

Fig. 2: Momentum conservation facilitates hot-carrier transitions.

From: Ultrasensitive dim-light neuromorphic vision sensing via momentum-conserved reconfigurable van der Waals heterostructure

Fig. 2

a Illustration of the MAPbI3/Bi2O2Se heterojunction-based field-effect transistor (FET) for neuromorphic vision sensing. b Cross-sectional high-resolution transmission electron microscopy (HRTEM) image of the MAPbI3/Bi2O2Se heterojunction. The scale bar is 2 nm. c Typical transfer curves of MAPbI3/Bi2O2Se heterojunction-based FETs. d Time-resolved photoluminescence (TRPL) spectroscopy of MAPbI3 and MAPbI3/Bi2O2Se heterojunction films upon the light excitation of 470 nm. Pseudocolor femtosecond transient absorption (fs-TA) plots of e MAPbI3, and f MAPbI3/Bi2O2Se heterojunction. g Normalized fs-TA spectra of MAPbI3 and MAPbI3/Bi2O2Se heterojunction films within the 1.2 ps after the photoexcitation. h Decay dynamics of the hot-carrier temperature within MAPbI3 and MAPbI3/Bi2O2Se heterojunction films. i Decay dynamics of the ground-state photobleaching band peaks at 1.65 eV within MAPbI3 and MAPbI3/Bi2O2Se heterojunction films.

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