Comprehensive Experimental Design of PbS Short-wave Infrared Photodetectors via Two-step Passivation and Photoelectric Performance Characterization#br#
HAN Zeyao * ，ZHANG Li，SUN Bin，SONG Chunyuan
State Key Laboratory of Organic Electronics and Information Displays，Nanjing University of Posts and Telecommunications，
Nanjing 210023，China
Abstract: Lead sulfide colloidal quantum dots have emerged as a significant research focus in short-wave
infrared (SWIＲ)detection due to their tunable bandgaps and solution-processing advantages． However，
professional experimental teaching frequently faces challenges such as a lack of cutting-edge content and
fragmented practical training modules．Leveraging the research group＇s established expertise，this paper presents
a comprehensive，full-process experimental project spanning from material synthesis to device architecture and
terminal imaging applications．Central to this design is a two-step passivation strategy，which guides students to
comparatively explore the impact of different ligand exchange processes on surface defects and the resulting
photoelectric performance of SWIＲ detectors． The results demonstrate that the two-step passivated devices
achieve an external quantum efficiency exceeding 40% at 1 350 nm and facilitate successful perspective fusion
imaging of objects concealed within opaque capsules．By bridging abstract semiconductor physics with hands-on
device fabrication，this project utilizes visualized imaging to stimulate student engagement，effectively enhancing
their engineering proficiency and innovative capacity．
