Lateral Photodetectors Based on Double-Cable Polymer/Two-Dimensional Perovskite Heterojunction

Area of Science:

• Materials Science
• Optoelectronics
• Polymer Chemistry

Background:

• Double-cable conjugated polymers offer solution processibility and tunable optoelectronic properties.
• Two-dimensional (2D) Ruddlesden-Popper perovskites are promising for next-generation photodetectors.
• Combining these materials in a heterojunction can leverage their complementary strengths.

Purpose of the Study:

• To design and fabricate a lateral photodetector (PD) using a heterojunction of double-cable conjugated polymer and 2D perovskite films.
• To evaluate the optoelectronic performance of the heterojunction PD and compare it to single-layer devices.
• To demonstrate the feasibility of creating flexible PDs based on this heterojunction architecture.

Main Methods:

• Fabrication of a lateral photodetector by layering a double-cable conjugated polymer film atop a 2D perovskite film.
• Characterization of the device performance, including responsivity, on/off ratio, and response times.
• Fabrication of a flexible device using a polyimide substrate.

Main Results:

• The heterojunction photodetector achieved a high responsivity of 27.06 A W⁻¹ and an on/off ratio of 1379.
• The device exhibited a fast response with rise and decay times of 3.53 ms and 3.78 ms, respectively.
• A flexible version of the device demonstrated comparable performance to the rigid glass-based counterpart.

Conclusions:

• The double-cable polymer/2D perovskite heterojunction significantly enhances photodetector performance.
• This heterojunction architecture holds great potential for developing high-performance, flexible optoelectronic devices.
• The study paves the way for future applications in areas like wearable electronics and advanced imaging.