TY - JOUR
T1 - A supplemental solution to surface-passivate large-size PbSe quantum dots for high-performance photodetectors
AU - Zhu, Mengchun
AU - Yang, Shengyi
AU - Zou, Guanzhen
AU - Xin, Haiyuan
AU - Ge, Zhenhua
AU - Wang, Ying
AU - Zou, Bingsuo
AU - Jiang, Yurong
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/1/31
Y1 - 2025/1/31
N2 - As a promising material, lead selenide (PbSe) colloidal quantum dots (CQDs) are widely studied for its applications in the next generation photodetectors due to their solution-processability and low cost. However, the (100) surfaces PbSe QDs are usually passivated incompletely by the traditional liquid-phase ligand exchange with the halogen ligands when the diameter of PbSe QDs is larger than 5.0 nm. As compared to the traditional strategies of the halogen ligands, in this work methylammonium acetate (MAAc) was added as an additive into the PbI2 ligand solution to form the perovskite intermediate (i.e. MAPbI3-xAcx) as the ligand attached onto the (100) face of PbSe, in this way, to enhance the surface passivation and the dispersion of PbSe CQDs. Therefore, the as-synthesized infrared photodetector ITO/ZnO/PbSe-MAPbI3-xAcx/Ag showed decreased dark current by more than five-fold, and thus its device performance is enhanced greatly. As a result, a high photoresponsivity of 0.32 mA/W with a specific detectivity of 1.16 × 1011 Jones was obtained from the photodetector ITO/ZnO/PbSe-MAPbI3-xAcx/Ag under 47.8 µW/cm2 1550 nm illumination. Thus, it provides a supplemental solution to completely surface-passivate CQDs in large size for next generation optoelectronics.
AB - As a promising material, lead selenide (PbSe) colloidal quantum dots (CQDs) are widely studied for its applications in the next generation photodetectors due to their solution-processability and low cost. However, the (100) surfaces PbSe QDs are usually passivated incompletely by the traditional liquid-phase ligand exchange with the halogen ligands when the diameter of PbSe QDs is larger than 5.0 nm. As compared to the traditional strategies of the halogen ligands, in this work methylammonium acetate (MAAc) was added as an additive into the PbI2 ligand solution to form the perovskite intermediate (i.e. MAPbI3-xAcx) as the ligand attached onto the (100) face of PbSe, in this way, to enhance the surface passivation and the dispersion of PbSe CQDs. Therefore, the as-synthesized infrared photodetector ITO/ZnO/PbSe-MAPbI3-xAcx/Ag showed decreased dark current by more than five-fold, and thus its device performance is enhanced greatly. As a result, a high photoresponsivity of 0.32 mA/W with a specific detectivity of 1.16 × 1011 Jones was obtained from the photodetector ITO/ZnO/PbSe-MAPbI3-xAcx/Ag under 47.8 µW/cm2 1550 nm illumination. Thus, it provides a supplemental solution to completely surface-passivate CQDs in large size for next generation optoelectronics.
KW - Colloidal quantum dots (CQDs)
KW - Infrared Photodetector
KW - Ligand exchange
KW - Methylammonium acetate (MAAc)
KW - Perovskite intermediate
UR - https://www.scopus.com/pages/publications/85214345983
U2 - 10.1016/j.jallcom.2025.178598
DO - 10.1016/j.jallcom.2025.178598
M3 - Article
AN - SCOPUS:85214345983
SN - 0925-8388
VL - 1013
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 178598
ER -