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Dokument Type: Article
metadata.dc.title: High-speed nonlinear focus-induced photoresponse in amorphous silicon photodetectors for ultrasensitive 3D imaging applications
Authors: Bablich, Andreas 
Müller, Maurice  
Kienitz, Paul 
Bornemann, Rainer 
Ogolla, Charles Otieno 
Butz, Benjamin 
Choubey, Bhaskar 
Haring Bolívar, Peter 
Institute: Department Elektrotechnik - Informatik 
Free keywords: 3D imaging sensors
Dewey Decimal Classification: 621.3 Elektrotechnik, Elektronik
Issue Date: 2022
Publish Date: 2023
Source: Scientific reports ; 12 (1), article number 10178. -
A large and growing number of applications benefit from simple, fast and highly sensitive 3D imaging sensors. The Focus-Induced Photoresponse (FIP) can achieve 3D sensing functionalities by simply evaluating the irradiance dependent nonlinear sensor response in defect-based materials. Since this advantage is intricately associated to a slow response, the electrical bandwidth of present FIP detectors is limited to a few kHz only. The devices presented in this work enable modulation frequencies of 700 kHz and beat frequency detection up to at least 3.8 MHz, surpassing the bandwidth of reported device architectures by more than two orders of magnitude. The sensors achieve a SNR of at least ∼53dB at 115cm and a DC FIP detection limit of 0.6 µW/mm2. The mature and scalable low-temperature a-Si:H process technology allows operating the device under ambient air conditions waiving additional back-end passivation, geometrical fill factors of 100% and tailoring the FIP towards adjustable 3D sensing applications.
Finanziert im Rahmen der DEAL-Verträge durch die Universitätsbibliothek Siegen
URN: urn:nbn:de:hbz:467-24393
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