Dresden 2020 – wissenschaftliches Programm
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HL 76.22: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG
irradiance dependent photoresponse organic near infrared photodetectors for distance measurement — •yazhong wang1, christoph lungenschmied2, karl leo1, and donato spoltore1 — 1iapp, tu dresden, dresden, germany — 2trinamix gmbh, industriestrasse 35, 67063 ludwigshafen am rhein, germany
Focus-Induced Photoresponse (FIP) technique is a new and elegant optical distance measurement solution. Organic near infrared (NIR) optical distance photodetectors based on FIP technique are irradiance dependent which is realized by inserting an extraction barrier for holes within the photodetectors. In this work, the barrier is introduced by replacing the normal hole transporting layer (HTL) material with a deeper highest occupied molecular orbital (HOMO) HTL material into an organic solar cell device. Holes are piled up by the extraction barrier, which increases the probability of charge recombination. With increasing irradiance, which can be achieved by decreasing the illumination spot area on the photodetector, the probability of charge recombination is becoming higher and higher. We demonstrate the organic NIR optical distance photodetectors with detection area up to 2.52 cm2 and detection wavelengths at 850 nm and 1060 nm. Such NIR photodetectors have highly potential to be utilized as robust, low-cost and simple optical distance measurement setup.