Optical tuning of exciton and trion emissions in monolayer phosphorene
By Jiong Yang, Renjing Xu, Jiajie Pei, Ye Win Myint, Fan Wang, Zhu Wang, Shuang Zhang, Zongfu Yu, Yuerui Lu. Light: Science & Applications, 2015
337 citations recorded by the source corpus.
Monolayer phosphorene provides a unique two-dimensional (2D) platform to investigate the fundamental dynamics of excitons and trions (charged excitons) in reduced dimensions. However, owing to its high instability, unambiguous identification of monolayer phosphorene has been elusive. Consequently, many important fundamental properties, such as exciton dynamics, remain underexplored. We report a rapid, noninvasive, and highly accurate approach based on optical interferometry to determine the layer number of phosphorene, and confirm the results with reliable photoluminescence measurements. Furthermore, we successfully probed the dynamics of excitons and trions in monolayer phosphorene by controlling the photo-carrier injection in a relatively low excitation power range. Based on our measured optical gap and the previously measured electronic energy gap, we determined the exciton binding energy to be ∼0.3 eV for the monolayer phosphorene on SiO2/Si substrate, which agrees well with theoretical predictions. A huge trion binding energy of ∼100 meV was first observed in monolayer phosphorene, which is around five times higher than that in transition metal dichalcogenide (TMD) monolayer semiconductor, such as MoS2. The carrier lifetime of exciton emission in monolayer phosphorene was measured to be ∼220 ps, which is comparable to those in other 2D TMD semiconductors. Our results open new avenues for exploring fundamental phenomena and novel optoelectronic applications using monolayer phosphorene. An optical scheme for determining the number of monolayers on two-dimensional materials has been developed. Research into two-dimensional materials is thriving, but developing a way to identify a single monolayer has proved challenging. Now, Jiong Yang and co-workers have used phase-shifting interferometry to deduce the number of phosphorene layers. They then performed power-dependent photoluminescence measurements to determine various excitonic properties of a monolayer on a silicon oxide/silicon substrate. They obtained an exciton binding energy of about 0.3 electron volts, which agrees well with theoretical predictions. The researchers measured a carrier lifetime of approximately 220 picoseconds, which is comparable to that of the transition-metal dichalcogenides, another class of two-dimensional semiconductors. They also measured a trion binding energy of about 100 milli-electron volts, which is around five times higher than that of transition-metal dichalcogenides.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/25ab14f5f3eb503a86a00e8db725282c35bc642a
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Electrical and Electronic Engineering
In Materials Chemistry
Citations in the corpus
- Recent advances in synthesis, properties, and applications of phosphorene (2017, methodology): “Due to the aforementioned challenges, optical interferometry offers a rapid, noninvasive, and highly accurate approach to determine the layer number.(61)”
- 2D semiconducting materials for electronic and optoelectronic applications: potential and challenge (2020, background): “[19] Yang J, Xu R, Pei J, Myint Y W, Wang F, Wang Z, Zhang S, Yu Z”
- The rising star of 2D black phosphorus beyond graphene: synthesis, properties and electronic applications (2017, background): “Beyond that, the relatively high carrier mobility [31, 101, 119] and rapid photogenerated carrier survival time of 100 ps [119] are the two vital features of black phosphorus for the application in the field of photoelectric detection [120] and solar cell [121, 122].”