Photo-carrier extraction by triboelectricity for carrier transport layer-free photodetectors.

Efficient carrier extraction is essential for high performance optoelectronic devices, such as solar cells and photodetectors. Conventional strategies to separate photogenerated carriers typically involve the fabrication of a p-n junction by doping and the use of carrier selective charge transport layers. However, these techniques often require high temperature processes or costly materials. In this work, we demonstrate an innovative and simple approach of extracting photogenerated carriers from organometallic halide perovskites utilizing triboelectricity. The triboelectric device can be easily fabricated at low temperature using inexpensive materials on plastic substrates, enabling it to be readily integrated into self-powered optoelectronic devices. As a proof-of-concept, we fabricated a triboelectrics-assisted perovskite photodetector, which enabled us to study the surface charges generated using different electrical contacts and bending conditions performed by the device. With the assistance of a triboelectric charge-induced electric field, the photocurrent and transient photoresponses were significantly enhanced. Furthermore, we integrated the plastic triboelectric device with a flexible photodetector to demonstrate this carrier collection approach in flexible/wearable electronics. To the best of our knowledge, this work is the first report of carrier extraction in organometallic halide perovskite photodetector by triboelectric charges, demonstrating a potential use for carrier extraction in other semiconductor-based optoeletronic devices. Image 1 ● We demonstrate a novel approach to extract photo-generated carriers from an organometallic halide perovskite PD by triboelectricity generated by harvesting mechanical energy. ● We study and verify the working principle of photo-carrier extraction by such an approach by a series of electrical characterization. ● We demonstrate the modulation of photoresponse of a perovskite PD by mechanical bending of the triboelectric generator. ● This work not only presents an innovative approach to realize photo-carrier extraction by triboelectricity from mechanical motion, but also demonstrates carrier transport layer-free optoelectronic devices for potentially more simple and stable devices. [ABSTRACT FROM AUTHOR]