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. 2019 Dec 5;7(7):1239–1246. doi: 10.1093/nsr/nwz200

Figure 1.

Figure 1.

(a) Chemical structures of BTP-4Cl-X, where X represents 8, 12 or 16. (b) Normalized absorption spectra of BTP-4Cl-X in diluted (solid line) and concentrated (dashed line) chlorobenzene solutions. (c) Normalized absorption spectra of the neat donor and acceptors in thin films. (d) J–V curves of the best devices. The inset is a statistical diagram of PCEs for PBDB-TF:BTP-4Cl-12-based cells. (e) J–V curve of the OPV cell certified in the NIM. (f) EQE curves of the corresponding OPV cells.