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(Color online) Schematic representation of near-field optical beam induced current (n-OBIC) of polycrystalline- solar cell. The titanium backcontact was photolithographically patterned and selectively etched to reveal the -thick backcontact layer over a window. The NSOM tip photoinjects carriers within a subwavelength volume ( spot, indicated in red). Device structure is shown at the right (for a more detailed description see the text).
(Color online) (a) Left: Topographic image of polycrystalline- solar cell within a lithographically defined and selectively etched portion of the sample, wherein the Ti backcontact was selectively etched away. Right: Simultaneously acquired near-field optical beam induced current image [color scale in nm(nA)]. (b) Line scans extracted from n-OBIC image above as indicated by horizontal dashed lines: Triangles: lower-line; squares: upper-line. (c) Additional representative photocurrent line scans traversing grain boundaries in other regions of the sample.
Real-space energy band diagram depicting predicted band-bending near grain boundaries, promoting charge separation of photoinjected electrons and holes at grain boundaries (labeled GB).
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