Related Experiment Video
Updated: Oct 11, 2025
11:26
Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
12.7K
Matching Charge Extraction Contact for Infrared PbS Colloidal Quantum Dot Solar Cells
Mingyu Li1,2, Shiwu Chen1, Xinzhao Zhao1
1Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|December 3, 2021
Summary
This study introduces improved infrared solar cells (IRSCs) using lead sulfide colloidal quantum dots (PbS CQDs). New electron extraction and passivation methods achieve over 10% power conversion efficiency, boosting infrared light utilization.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Infrared solar cells (IRSCs) are crucial for expanding solar spectrum utilization beyond silicon and perovskite technologies.
- Lead sulfide colloidal quantum dots (PbS CQDs) offer tunable bandgaps ideal for harvesting infrared solar energy.
- Scaling up PbS CQDs presents challenges in charge extraction and surface passivation due to energy level shifts and facet evolution.
Purpose of the Study:
- To develop advanced PbS CQD-based IRSCs with enhanced performance.
- To address challenges in charge extraction and surface passivation for larger PbS CQDs.
- To improve the power conversion efficiency (PCE) and stability of infrared solar cells.
Main Methods:
- Fabrication of energy-level aligned ZnO thin films via magnetron sputtering for electron extraction.
- Development of a modified hybrid ligand recipe for facet passivation of large PbS CQDs.
- Characterization of IRSC performance under AM1.5 full-spectrum illumination.
Main Results:
- The champion IRSC achieved an open circuit voltage of 0.49 V and a PCE of 10.47%.
- Certified PCE exceeded 10%, with a notable 1100 nm filtered efficiency of 1.23%.
- The developed devices demonstrated high storage stability.
Conclusions:
- Optimized electron extraction and QD passivation strategies significantly enhance infrared conversion efficiency.
- These advancements are expected to accelerate the development of novel quantum dot optoelectronics.
- The study provides a pathway for high-performance PbS CQD-based infrared solar cells.
