Role of Heterocyclic Organic Compounds on the Optoelectronic Properties of Halide Perovskite Single Crystals

Abstract

Single crystals (SCs) of metal halide perovskites (MHPs) are known to possess superior properties. However, the surface of the SCs possesses a higher defect density, which can deteriorate the optoelectronic properties of SCs. Herein, we have engineered the growth of methylammonium lead tribromide SCs using (R)-3-aminopiperidine dihydrochloride (API). The modified crystals also showed improved photoresponse validated by the increased photocurrent. The modified crystal showed a highest photoresistivity of 0.47 mA/W and a detectivity of 3.7 × 1011 Jones at an applied bias of 2 V. On the other hand, the control crystal showed a resistivity of 0.32 mA/W and a detectivity of 1.0 × 1011 Jones. This shows that the API additive improves the charge collection efficiency and reduces the recombination. The charge accumulation and ion migration were further studied using electrochemical impedance spectroscopy and capacitance–frequency measurement. Thus, this study presents systematic investigation of the electrical response of additive-modified crystals.

Understanding the Origin of Light Intensity and Temperature Dependence of Photodetection Properties in a MAPbBr3 Single-Crystal-Based Photoconductor

“…However, for the device with a 200 μm electrode spacing, the photocurrent increases gradually until it reaches a saturation. The change in photocurrent shape in the I – t plot for the SC-based PDs has also been observed by others. ,− For example, Cho et al demonstrated that the variation of photocurrent shape can be related to the changeable dominating factor from carrier trapping at the defect states to carrier recombination under the different illumination conditions . However, the mechanism underlying the change in photocurrent shape with changing the electrode spacing is still unclear and need further investigation.…”

Additive engineering in CH3NH3PbBr3 single crystals for terahertz devices and tunable high-order harmonics

“…92 A focused explanation of the change in photodetection properties with additives was given in our recently published work. 93,94…”

Growth mechanism of metal halide perovskite single crystals in solution

“…39 Furthermore, the presence of certain groups and carbon chain length characteristics in the additive contributes to the hydrophobicity and stability of the active layer in perovskite solar cells. 73–75 As shown in Fig. 4c, the conventional solvent ( e.g .…”