Microsecond photocapacitance transients observed using a charged microcantilever as a gated mechanical integrator.

ABSTRACT: How light is converted to electricity in blends of organic donor and acceptor molecules is an unsettled question, partly because the spatial heterogeneity present in these blends makes them challenging to characterize. Although scanned-probe measurements have provided crucially important microscopic insights into charge generation and transport in these blends, achieving the subnanosecond time resolution needed to directly observe the fate of photogenerated charges has proven difficult. We use a charged microcantilever as a gated mechanical integrator to record photocapacitance indirectly by measuring the accumulated change in cantilever phase as a function of the time delay between precisely synchronized voltage and light pulses. In contrast with previous time-resolved scanned-probe photo

SUBMITTER: Dwyer RP 

PROVIDER: S-EPMC5479705 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature