TY - JOUR
T1 - Dissociation of two-dimensional excitons in monolayer WSe2
AU - Massicotte, Mathieu
AU - Vialla, Fabien
AU - Schmidt, Peter
AU - Lundeberg, Mark B.
AU - Latini, Simone
AU - Haastrup, Sten
AU - Danovich, Mark
AU - Davydovskaya, Diana
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Fal'ko, Vladimir I.
AU - Thygesen, Kristian Sommer
AU - Pedersen, Thomas Garm
AU - Koppens, Frank H. L
PY - 2018/4/24
Y1 - 2018/4/24
N2 - Two-dimensional (2D) semiconducting materials are promising building blocks for optoelectronic applications, many of which require efficient dissociation of excitons into free electrons and holes. However, the strongly bound excitons arising from the enhanced Coulomb interaction in these monolayers suppresses the creation of free carriers. Here, we identify the main exciton dissociation mechanism through time and spectrally resolved photocurrent measurements in a monolayer WSe
2 p-n junction. We find that under static in-plane electric field, excitons dissociate at a rate corresponding to the one predicted for tunnel ionization of 2D Wannier-Mott excitons. This study is essential for understanding the photoresponse of 2D semiconductors and offers design rules for the realization of efficient photodetectors, valley dependent optoelectronics, and novel quantum coherent phases.
AB - Two-dimensional (2D) semiconducting materials are promising building blocks for optoelectronic applications, many of which require efficient dissociation of excitons into free electrons and holes. However, the strongly bound excitons arising from the enhanced Coulomb interaction in these monolayers suppresses the creation of free carriers. Here, we identify the main exciton dissociation mechanism through time and spectrally resolved photocurrent measurements in a monolayer WSe
2 p-n junction. We find that under static in-plane electric field, excitons dissociate at a rate corresponding to the one predicted for tunnel ionization of 2D Wannier-Mott excitons. This study is essential for understanding the photoresponse of 2D semiconductors and offers design rules for the realization of efficient photodetectors, valley dependent optoelectronics, and novel quantum coherent phases.
UR - http://www.scopus.com/inward/record.url?scp=85045970703&partnerID=8YFLogxK
U2 - 10.1038/s41467-018-03864-y
DO - 10.1038/s41467-018-03864-y
M3 - Journal article
C2 - 29691376
SN - 2041-1723
VL - 9
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 1633
ER -