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In this work, the influence of Au plasmonics on photocurrent generation inthe visible wavelength range in integrated thiol-linked CdSe quantum dot/Aunanogap structures is demonstrated. The plasmonic absorption is sensedutilizing photoacoustic (PA) detection technique. The laser diode is modulatedto generate the PA excitation that oscillates the air-filled cell. When lightabsorption increases, an enhanced acoustic signal is captured by a microphone.The observed enhancement in the PA response is related to plasmonic absorptionby the Au layers and the response is further enhanced by about 20% due to CdSeQDs. In our structure, the surface plasmon resonance (SPR) wavelength isapproximately 500 nm. The SPR is utilized for generating photocurrents in CdSequantum dots. Due to energy transfer from the dot to closely spaced Au surfacethrough thiol links, a smooth transmission channel of electrons is establishedthat forms a detectable photocurrent, which can be tuned by a bias voltage.These plasmonic nanogap structures can enable higher sensitivity inphotovoltaics, photodetection and sensing.

Photocurrent and photoacoustic detection of plasmonic behavior of CdSe quantum dots grown in Au nanogaps