Two-Dimensional Nanocrystal Assemblies for Photocapacitive Devices Two-Dimensional Nanocrystal Assemblies for Photocapacitive Devices AITranslate

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DOI：https://doi.org/10.1021/acsaelm.2c01785

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We describe the emergence of photocapacitance in two-dimensional layered nanocrystal assemblies. Devices are electrically probed by the application of a lateral bias across interdigitated electrodes. We observe capacitive current–voltage characteristics that are individually absent in the nanocrystals. Besides the occurrence of a large zero-bias capacitance, the assemblies further show a transient negative capacitive behavior where the small signal capacitance is found to attain values over a ±100 nF range. We show that this system behaves as a damped anharmonic oscillator. Further, the bias dependence of capacitance, characteristics under asymmetric cycling, as well as its relationship with shunt resistance are consistent with the system attaining a transient negative capacitance while migrating around a single energy minimum. We show modulation of the capacitive behavior by incident light enabling the usage of these materials in a photocapacitive detector device.