Solution-Processed CsPbBr3 Quantum Dots/Organic Semiconductor Planar Heterojunctions for High-Performance
Kaixuan Chen1, Xuliang Zhang2, Ping-An Chen3
1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha, 410082, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 1, 2022
Summary
Solution-processed planar heterojunctions (PHJs) using perovskite quantum dots (PQDs) and organic semiconductors (OSCs) were fabricated. These devices show excellent performance for phototransistors and self-powered photodiodes, highlighting potential for optoelectronics.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Planar heterojunctions (PHJs) are crucial for semiconductor devices.
- Fabricating PHJs with solution-processable semiconductors like organic semiconductors (OSCs) presents challenges.
Purpose of the Study:
- To develop a solution-processable fabrication method for PHJs using perovskite quantum dots (PQDs) and OSCs.
- To investigate the optoelectronic performance of these novel PHJs in phototransistors and photodiodes.
Main Methods:
- Utilized orthogonal solubility and wettability between CsPbBr3 PQDs and OSCs.
- Fabricated bilayer PQD/OSC PHJs for phototransistors.
- Constructed tri-layer OSC/PQD/OSC PHJs for self-powered photodiodes.
Main Results:
- PQD/OSC phototransistors demonstrated high responsivity (1.64 × 10^4 A W^-1), detectivity (3.17 × 10^12 Jones), and photosensitivity (5.33 × 10^6).
- Self-powered photodiodes exhibited broad spectral response (UV to NIR) with responsivity ~10^-1 A W^-1 and detectivity >10^6 Jones.
- Attributed high performance to efficient charge dissociation, transport, and photogating effects.
Conclusions:
- Presented a convenient and scalable process for solution-processed PHJs.
- Demonstrated the significant potential of PQD/OSC PHJs for advanced optoelectronic applications.
