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A platform for integrated spectrometers based on solution-processable semiconductors

A platform for integrated spectrometers based on solution-processable semiconductors
Working principle of the integrated spectrometers. (a) The schematic working mechanism of the integrated spectrometer. Conjugated-BIC photonics and combined waveguides are planarly integrated with perovskite photodiode arrays. Monochromatic light with a specific wavelength can be coupled into the waveguide and propagate to the corresponding photodiode for an ultra-narrowband response. (b) Top-view SEM image of an ultra-narrowband photodiode that constitutes the integrated spectrometer. Zoom-in SEM image: details of the grating. (c) Schematic mechanism comparison between our mechanism (upper panel) and the conventional mechanisms (middle and lower panels). Curves represent the photocarrier density generated by lights with different wavelengths. Credit: Light: Science & Applications (2023). DOI: 10.1038/s41377-023-01231-1

Acquiring real-time spectral information in point-of-care diagnosis, internet-of-things, and other lab-on-chip applications requires spectrometers with hetero-integration capability and miniaturized features. Compared to conventional semiconductors integrated by heteroepitaxy, solution-processable semiconductors provide a much-flexible integration platform due to their solution-processability, and therefore, are more suitable for the multi-material integrated system. However, solution-processable semiconductors are usually incompatible with micro-fabrication processes, making them far from practical use in various lab-on-chip applications.

In a new paper published in Light: Science & Applications, a team of scientists led by Professor Qinghai Song from Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology (Shenzhen), China have proposed a facile and universal platform to fabricate integrated with solution-processable semiconductors by unprecedently involving the conjugated mode of bound states in the continuum (conjugated-BIC) photonics.

Specifically, exploiting the conjugated-BIC photonics, which remains unexplored in conventional lasing studies, renders the broadband photodiodes with ultra-narrowband detection ability, detection wavelength tunability, and on-chip integration ability while ensuring device performance. Spectrometers based on these ultra-narrowband photodiode arrays exhibit high spectral resolution and wide/tunable spectral bandwidth.

The fabrication processes are compatible with solution-processable semiconductors photodiodes like perovskites and , which can be potentially extended to conventional semiconductors. Signals from the spectrometers directly constitute the incident spectra without being computation-intensive, latency-sensitive, or error-intolerant. As an example, integrated spectrometers based on perovskite photodiodes are capable of realizing narrowband/broadband light reconstruction and in-situ hyperspectral imaging. The reported platform provides insight into constructing integrated spectrometers with multi-material integrated systems.

"Exploring the conjugated-BIC is unconventional when compared with those popular BIC lasing studies. Through the theoretical study, we find that the conjugated-BIC experiences high leakage and decent Q while it can be easily excited and coupled. Considering that the conjugated-BIC photonics can be facilely fabricated and their resonant wavelengths can be effectively tuned, we anticipate that the conjugated-BIC is very suitable for wavelength-resolved photodetection applications," state the researchers.

"Solving the problems in fabricating perovskite photodiode arrays and integrating them with the conjugated-BIC photonics by micro-fabrication processes are also important since the materials and device interfaces of the devices can be easily destroyed during the processes by solvents and heat. We also believe that the -optoelectronics integration platform we proposed can provide insight into broadening the functionalities and applications of the emerging solution-processable semiconductors like perovskites," the scientists conclude.

More information: Yanhao Li et al, A platform for integrated spectrometers based on solution-processable semiconductors, Light: Science & Applications (2023). DOI: 10.1038/s41377-023-01231-1

Journal information: Light: Science & Applications

Citation: A platform for integrated spectrometers based on solution-processable semiconductors (2023, August 1) retrieved 6 December 2023 from
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