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. 2015 Sep 18;6:8242. doi: 10.1038/ncomms9242

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J–V curves for (a) PTB7:hPDI3 and PTB7-Th:hPDI3 solar cells, (b) PTB7:hPDI4 and PTB7-Th:hPDI4 solar cells under optimized conditions and simulated AM 1.5G irradiation (100 mW cm⁻²). EQE spectra of (c) PTB7:hPDI3, PTB7-Th:hPDI3 and (d) PTB7:hPDI4, PTB7-Th:hPDI4 solar cells under optimized conditions.