Optoelectronic measurements were performed using a custom-built setup (59). Photocurrent measurements were performed using a continuous-wave laser (λin = 514 nm, P = 15 W/cm2) rastered on the devices to produce spatial maps of the photoresponse. The electrical signal was acquired by a DL Instruments Model 1211 current amplifier connected to a Signal Recovery model 7124 digital signal processing lock-in amplifier. The frequency modulation of the lasers was 73.87 Hz. EL and PL measurements were performed in the same setup using a Princeton Instruments SP2500i spectrometer and a PIXIS400 camera. All measurements were performed at room temperature in vacuum (P = 10−5 mbar).

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