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(a) UV-Vis absorption spectra of ZSTU-1, ZSTU-2 and ZSTU-3. (b) Zero-bias photocurrent response of ZSTU-1, ZSTU-2 and ZSTU-3 under chopped visible light illumination. Evolution of femtosecond TA spectra of (c) ZSTU-1 and (d) ZSTU-3 at different delay times (excitation at 380 nm). TA kinetics of (e) ZSTU-1 and (f) ZSTU-3 probed at 700 nm.
