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. 2014 Apr 15;4:4691. doi: 10.1038/srep04691

Figure 1.

Figure 1

(a) Molecular structures of P3HT, PBT1, PBDTBDD-C-T, PBDTBDD, PC60BM, PC70BM and ZrAcac; (b) Device structure of the polymer solar cells; (c) Schematic energy diagram of the materials involved in the PSCs; (d) UPS spectra of a-ZrAcac on ITO substrate.