Two-step fabrication of R-PbI_4(1-y)Br_4y type light emitting inorganic-organic hybrid photonic structures

Abstract

An easy fabrication approach for highly c-axis oriented Inorganic-Organic (IO) mixed hybrid semiconductor thin films has been demonstrated for the first time. A simple vacuum deposition technique followed by chemical processing is utilized to fabricate controlled thin films of wide range of selective compositions from R-PbI4(1-y)Br4y (R = organic; y = 0 to 1) type IO hybrids. These thin films are alternative stack of inorganic and organic nanoscale layers, resembles multiple quantum wells. As a result, they show several novel features including tunable strong room-temperature excitons over a broad spectral range from 380 nm to 520 nm. Structural and in situ optical studies confirm that the methodology can be directly adoptable in top-down technology and also extendable for many varieties of inorganic-organic frameworks. The device quality fabrication process and optoelectronic multi-functionality has been demonstrated by template based 3D microstructures, exciton PL imaging and photodetector response.