TY - JOUR
T1 - Impurity-Induced Robust Trionic Effect in Layered Violet Phosphorus
AU - Li, Yanyong
AU - Cai, Songhua
AU - Lai, Wai Kin
AU - Wang, Chenhao
AU - Rogée, Lukas
AU - Zhuang, Lyuchao
AU - Zhai, Lingling
AU - Lin, Shenghuang
AU - Li, Mingjie
AU - Lau, Shu Ping
N1 - Funding Information:
This work was financially supported by the Hong Kong Polytechnic University (PolyU) grants (1‐ZVGH and 1‐BD96) and the Research Grants Council of Hong Kong (Project nos. PolyU 153039/17P and 5303219). S.H.C. acknowledges the support of National Laboratory of Solid State Microstructures, Nanjing University (M34001).
Publisher Copyright:
© 2021 Wiley-VCH GmbH.
PY - 2022/1/4
Y1 - 2022/1/4
N2 - Trionic effect is a vital excitonic physical phenomenon, which intensively affects the optical and optoelectronic properties of 2D materials. Violet phosphorus (VP) is another allotrope of elemental phosphorus with robust photoluminescence (PL) emission in the visible range. So far, experimental investigations of the excitonic behavior in VP are quite scarce. Herein, the evolution of the PL mechanism in synthesized VP crystals against the Ar+ plasma exposure is investigated with emphasis on a conversion from trion to exciton emission. The estimated trion binding energy of VP is ≈109 meV, relatively larger than common layered materials. By analyzing the chemical states and the atomic structures, the conversion mechanism is proposed as follows. The Ar+ plasma treatment reduces the stannous Sn-I-P impurities’ population, which are incorporated into the VP lattices and serve as the n-type dopants leading to the trion formation. Besides, various surface defects (POx) can promote the trion-to-exciton conversion by withdrawing electrons from VP in the process and act as hole-trap centers to enhance the photodetection of VP phototransistors. This work reveals that the layered VP crystal can provide an ideal platform to study the excitonic physics and future trionic devices at the 2D limit.
AB - Trionic effect is a vital excitonic physical phenomenon, which intensively affects the optical and optoelectronic properties of 2D materials. Violet phosphorus (VP) is another allotrope of elemental phosphorus with robust photoluminescence (PL) emission in the visible range. So far, experimental investigations of the excitonic behavior in VP are quite scarce. Herein, the evolution of the PL mechanism in synthesized VP crystals against the Ar+ plasma exposure is investigated with emphasis on a conversion from trion to exciton emission. The estimated trion binding energy of VP is ≈109 meV, relatively larger than common layered materials. By analyzing the chemical states and the atomic structures, the conversion mechanism is proposed as follows. The Ar+ plasma treatment reduces the stannous Sn-I-P impurities’ population, which are incorporated into the VP lattices and serve as the n-type dopants leading to the trion formation. Besides, various surface defects (POx) can promote the trion-to-exciton conversion by withdrawing electrons from VP in the process and act as hole-trap centers to enhance the photodetection of VP phototransistors. This work reveals that the layered VP crystal can provide an ideal platform to study the excitonic physics and future trionic devices at the 2D limit.
UR - http://www.scopus.com/inward/record.url?scp=85117218591&partnerID=8YFLogxK
U2 - 10.1002/adom.202101538
DO - 10.1002/adom.202101538
M3 - Journal article
AN - SCOPUS:85117218591
SN - 2195-1071
VL - 10
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 1
M1 - 2101538
ER -