Sensitive and Robust Ultraviolet Photodetector Array Based on Self-Assembled Graphene/C₆₀ Hybrid Films

Abstract

Graphene has been widely investigated for use in high-performance photodetectors due to its broad absorption band and high carrier mobility. While exhibiting remarkably strong absorption in the ultraviolet range, the fabrication of a large-scale integrable, graphene-based ultraviolet photodetector with long-term stability has proven to be a challenge. Here, using graphene as a template for C assembly, we synthesized a large-scale all-carbon hybrid film with inherently strong and tunable UV aborption. Efficient exciton dissociation at the heterointerface and enhanced optical absorption enables extremely high photoconductive gain, resulting in UV photoresponsivity of ∼10 A/W. Interestingly, due to the electron-hole recombination process at the heterointerface, the response time can be modulated by the gate voltage. More importantly, the use of all-carbon hybrid materials ensures robust operation and further allows the demonstration of an exemplary 5 × 5 (2-dimensional) photodetector array. The devices exhibit negligible degradation in figures of merit even after 2 month of operation, indicating excellent environmental robustness. The combination of high responsivity, reliability, and scalable processability makes this new all-carbon film a promising candidate for future integrable optoelectronics.

Design strategies for two‐dimensional material photodetectors to enhance device performance

“…[95][96][97] Such novel materials also need to combine with other materials to promote entire performance. 39,73,98,99 Qiao et al incorporated a similar hexagonal symmetry Bi 2 Te 3 with graphene as shown in Figure 5G, the photodetector demonstrated a strong and broadband responsivity reach telecommunication band (35 A/W and extend to 1550 nm depicted in Figure 5H). 73…”

All-carbon hybrids for high-performance electronics, optoelectronics and energy storage

“…The device can directly convert optical stimuli into electrical pulses in a highly neuron-like fashion and exhibits flexible tuning of both the short-and long-term plasticity, as shown in Figure 6(g). Now all-carbon hybrid based on graphene/C 60 has attracted increasing attention because of their longterm stability, facile processing and large-scale processability [161][162][163][164] act as a potential candidate for future integrable optoelectronic applications. Wang group [161] demonstrated a large-scale integrable ultraviolet arrayed photodetector employing large-area graphene/C 60 hybrids, as shown in Figure 6(h) and (i).…”

“…Now all-carbon hybrid based on graphene/C 60 has attracted increasing attention because of their longterm stability, facile processing and large-scale processability [161][162][163][164] act as a potential candidate for future integrable optoelectronic applications. Wang group [161] demonstrated a large-scale integrable ultraviolet arrayed photodetector employing large-area graphene/C 60 hybrids, as shown in Figure 6(h) and (i). Remarkably, the efficient exciton dissociation at the interface enables high photoconductive gain and a photoresponsivity exceeding 10 7 AW −1 for 200 nm irradiation.…”

Charge Transport Behavior and Ultrasensitive Photoresponse Performance of Exfoliated F16CuPc Nanoflakes

“…Organic π‐conjugated small molecule‐ and polymer‐based optoelectronic devices are of extraordinary significance for their merits over their inorganic counterparts, including excellent mechanical flexibility, cost‐effective fabrication, and tunable optoelectronic properties by rational molecular structure design, and broad material choices . More importantly, organic semiconductors can efficiently absorb light in the optical spectrum from UV to NIR either panchromaticly or selectively and show good photogeneration yield, which enables their successful development in the field of light detection . Panchromatic sensitive materials have aroused considerable attention for light detectors in various fields such as environmental monitoring, optical communication, or laboratory instrumentation for optical spectroscopy .…”