TY - JOUR
T1 - Photo-Carrier Lifetime in Binary and Ternary Heterostructures of Transition Metal Dichalcogenides
AU - Han, Yoojoong
AU - Kim, Un Jeong
AU - Nugera, Florence A.
AU - Kim, Seok In
AU - Park, Yeonsang
AU - Cheon, Miyeon
AU - Kim, Gun Cheol
AU - Gutiérrez, Humberto R.
AU - Lee, Moonsang
AU - Son, Hyungbin
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/5
Y1 - 2023/5
N2 - Binary and ternary transition metal dichalcogenide (TMD) heterostructures, MSe2 and MSeS (where M = Mo or W), are investigated as future building blocks for high-performance device applications with a tailorable electronic bandgap. For light-emitting device applications, investigating the decay time of the material is a prerequisite. Herein, time-resolved photoluminescence (TRPL) of binary and ternary TMD heterostructures is measured. A tri-exponential function is adopted to fit the TRPL data. Short, medium, and long decay times are <50 ps, ≈400 ps, and >400 ps, respectively. Except for monolayer MoSe2 and MoSeS, only two PL decay time components are observed with a large contribution from short decay time photocarriers (>80%). Bilayer TMDs exhibit a much shorter PL decay time, which could be attributed to the indirect nature of excitons and different dielectric environments, compared with that of monolayer TMDs. Using the center-of-mass (CM) method, a PL decay time map is successfully obtained for binary and ternary TMD heterostructures. This allows the qualitative visualization of the decay time distribution within the heterostructure or among other materials. This technique could be applied to assess the decay time of materials used in high-performance light-emitting devices.
AB - Binary and ternary transition metal dichalcogenide (TMD) heterostructures, MSe2 and MSeS (where M = Mo or W), are investigated as future building blocks for high-performance device applications with a tailorable electronic bandgap. For light-emitting device applications, investigating the decay time of the material is a prerequisite. Herein, time-resolved photoluminescence (TRPL) of binary and ternary TMD heterostructures is measured. A tri-exponential function is adopted to fit the TRPL data. Short, medium, and long decay times are <50 ps, ≈400 ps, and >400 ps, respectively. Except for monolayer MoSe2 and MoSeS, only two PL decay time components are observed with a large contribution from short decay time photocarriers (>80%). Bilayer TMDs exhibit a much shorter PL decay time, which could be attributed to the indirect nature of excitons and different dielectric environments, compared with that of monolayer TMDs. Using the center-of-mass (CM) method, a PL decay time map is successfully obtained for binary and ternary TMD heterostructures. This allows the qualitative visualization of the decay time distribution within the heterostructure or among other materials. This technique could be applied to assess the decay time of materials used in high-performance light-emitting devices.
KW - carrier lifetime, decay time
KW - ternary lateral heterostructures
KW - time-resolved photoluminescence
KW - transition metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85146775106&partnerID=8YFLogxK
U2 - 10.1002/pssb.202200501
DO - 10.1002/pssb.202200501
M3 - Article
AN - SCOPUS:85146775106
SN - 0370-1972
VL - 260
JO - Physica Status Solidi (B): Basic Research
JF - Physica Status Solidi (B): Basic Research
IS - 5
M1 - 2200501
ER -