TY - JOUR
T1 - Broad-spectrum (UV-vis-Nir) high-performance photodetector based on perovskite/quantum dot tandem heterostructure
AU - Li, Yixuan
AU - Zhao, Yaxin
AU - Chen, Yiren
AU - Zhou, Rongxue
AU - Wang, Yi
AU - Huang, Ziyuan
AU - Li, Ying
AU - Jiang, Ke
AU - Sun, Xiaojuan
AU - Yu, Weili
AU - Li, Dabing
N1 - Publisher Copyright:
This journal is © The Royal Society of Chemistry, 2026.
PY - 2026/6/11
Y1 - 2026/6/11
N2 - Organic–inorganic hybrid perovskite materials demonstrate significant potential in photodetection due to their outstanding optoelectronic properties. However, their inherent structural characteristics result in limited light response in the ultraviolet and near-infrared bands (>800 nm), severely limiting their applications in multiband imaging, optical communications, and biomedical detection. This study extended the spectral response range of devices from the ultraviolet to the short-wave infrared region (1000–1600 nm) by constructing a heterojunction structure between PbS colloidal quantum dots (CQDs) and FA0.9Cs0.1PbI3 perovskite (PSK) thin films. The results indicate that a Type-II band alignment at the PbS/perovskite heterojunction interface promotes efficient separation and transport of photo-generated carriers. The fabricated ITO/SnO2/PbS/FA0.9Cs0.1PbI3/Au device achieved responsivities of 82.5 mA W−1 at 280 nm (UV), 319.3 mA W−1 at 520 nm (visible), and 63.3 mA W−1 at 1550 nm (near-IR), with specific detectivities (D*) of 4.3 × 1010, 1.7 × 1011, and 3.3 × 1012, respectively. This heterojunction detector exhibits fast response characteristics (rise/fall time: 160 ms/80 ms) under a 0.6 V bias. This study provides a novel material system and device design strategy for developing high-performance, low-cost multiband photodetectors.
AB - Organic–inorganic hybrid perovskite materials demonstrate significant potential in photodetection due to their outstanding optoelectronic properties. However, their inherent structural characteristics result in limited light response in the ultraviolet and near-infrared bands (>800 nm), severely limiting their applications in multiband imaging, optical communications, and biomedical detection. This study extended the spectral response range of devices from the ultraviolet to the short-wave infrared region (1000–1600 nm) by constructing a heterojunction structure between PbS colloidal quantum dots (CQDs) and FA0.9Cs0.1PbI3 perovskite (PSK) thin films. The results indicate that a Type-II band alignment at the PbS/perovskite heterojunction interface promotes efficient separation and transport of photo-generated carriers. The fabricated ITO/SnO2/PbS/FA0.9Cs0.1PbI3/Au device achieved responsivities of 82.5 mA W−1 at 280 nm (UV), 319.3 mA W−1 at 520 nm (visible), and 63.3 mA W−1 at 1550 nm (near-IR), with specific detectivities (D*) of 4.3 × 1010, 1.7 × 1011, and 3.3 × 1012, respectively. This heterojunction detector exhibits fast response characteristics (rise/fall time: 160 ms/80 ms) under a 0.6 V bias. This study provides a novel material system and device design strategy for developing high-performance, low-cost multiband photodetectors.
UR - https://www.scopus.com/pages/publications/105040751212
U2 - 10.1039/d6tc00776g
DO - 10.1039/d6tc00776g
M3 - Article
AN - SCOPUS:105040751212
SN - 2050-7526
VL - 14
SP - 9459
EP - 9466
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 22
ER -