Interplay Between Extra Charge Injection and Lattice Evolution in VO₂/CH₃NH₃PbI₃ Heterostructure

Abstract

Research interest in VO2, one of the well‐known transition metal oxides featured by the metal–insulator transition, has resulted in a half‐century's accumulation of fundamentals toward a crystal clear description of the transition mechanism. To understand the interplay between extra electrons and lattice across the transition in VO2‐based integrated electronic devices, a heterostructure of VO2/CH3NH3PbI3 is constructed to investigate the structural evolution when hot electrons are injected from CH3NH3PbI3 to VO2 upon light irradiation. The decrease in the resistance of VO2 confirms the presence of extra electrons injected from CH3NH3PbI3 upon light irradiation. Then, Raman spectra are used to study the structural evolution of VO2 with temperature. The damping in the Raman intensity and the shift in Raman peak of VO2 near transition temperature implicate that the interplay between extra electron injection and lattice weakens the V–V vibration in VO2. This study provides a fundamental framework for understanding the interplay between extra charge and lattice in VO2.

Flexible inorganic oxide thin-film electronics enabled by advanced strategies

“…The data indicated that external strain induced by the stretchable structure could tailor the phase transition of the VO 2 thin films. After revealing the effect of strain on the MIT properties of VO 2 thin films, Lin's group has fabric-ated a series of flexible sensors based on VO 2 /PDMS structure, which has good adhesiveness and cyclicity of deformation, as well as comparable response speed and sensitivity with rigid electronic devices [86,87] .…”

“…(f) Resistance changes at different environment temperatures [86] . (g) Schematic illustration of electrical conductance of the sensor and the behavior of the disconnection-reconnection when applied strain on the x-axis (transverse) and y-axis (longitudinal) [87] . (h-j) Real-time monitoring signals (h), temperature signals (i) and pulse signals (j) of the flexible temperature-strain composite sensor [87] .…”

“…to impose controllable tensile stress on VO 2 thin films on PDMS to form transverse and longitudinal zigzag cracks in advance and to detect the strain by the resistance change caused by crack displacement under strain [87] , as shown in Through the frequency analysis of the collected signals, they found that the surface temperature signal is a low frequency signal with variable frequency, while the pulse signal is a high frequency signal with higher amplitude than the surface temperature signal. Therefore, a surface temperature sig- ing process during depositing films on substrate with a smaller or larger lattice [93] .…”

Synthesis, properties, and applications of large-scale two-dimensional materials by polymer-assisted deposition

“…Metal oxides have received considerable attention because of their potential applications in nuclear targets [41][42][43][44][45][46][47] , spintronic devices [22][23][24][48][49][50][51][52][53] , and self-cleaning glasses [54] due to their versatile properties, including ferroelectricity, ferromagnetism, piezoelectricity, semiconductivity, and superconductivity. Many simple oxides, such as Eu 2 O 3 [41][42][43][44] , ZnO [21][22][23][24] , TiO 2 [1,[54][55][56][57][58] , and VO 2 [59][60][61][62][63][64] have been prepared by using PAD. Polymers can prevent metal ions from engaging in unwanted chemical reactions; thus, the growth of complex metal-oxide films through PAD is controllable and reproducible.…”