Abstract：
:The energy band alignment in solar cell devices is critically important because it largely governs elementary photovoltaic processes, such as the generation, separation, transport, recombination and collection of charge carriers. Despite the expenditure of considerable effort, the measurement of energy band depth profiles across multiple layers has been extremely challenging, especially for operando devices. Here we present direct visualization of the surface potential depth profile over the cross-sections of operando organic photovoltaic devices using scanning Kelvin probe microscopy. The convolution effect due to finite tip size and cantilever beam crosstalk has previously prohibited quantitative interpretation of scanning Kelvin probe microscopy-measured surface potential depth profiles. We develop a bias voltage-compensation method to address this critical problem and obtain quantitatively accurate measurements of the open-circuit voltage, built-in potential and electrode potential difference.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Chen Q,Mao L,Li Y,Kong T,Wu N,Ma C,Bai S,Jin Y,Wu D,Lu W,Wang B,Chen Ldoi
10.1038/ncomms8745subject
Has Abstractpub_date
2015-07-13 00:00:00pages
7745issn
2041-1723pii
ncomms8745journal_volume
6pub_type
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