Fig. 3: Height (left), surface potential (middle) images, and corresponding line scans of cesium–copper–iodide films. | Nature Communications

Fig. 3: Height (left), surface potential (middle) images, and corresponding line scans of cesium–copper–iodide films.

From: Efficient and bright warm-white electroluminescence from lead-free metal halides

Fig. 3

Scale bar, 500 nm. a Without Tween. b With Tween. The inclusion of Tween increases the average surface potential of cesium–copper–iodide film. The surface potential of the control film ranges from −99 to 69 mV, and that of the film with Tween is from 183 to 326 mV.

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