posted on 2004-11-04, 00:00authored bySaid Barazzouk, Surat Hotchandani, K. Vinodgopal, Prashant V. Kamat
Electrophoretically deposited single-wall carbon nanotube (SWCNT) films on optically transparent electrodes
are photoelctrochemically active and generate photocurrent upon visible excitation. A low photon-to-current
conversion efficiency of 0.15% suggests that most of the photogenerated charge carriers are lost in the
recombination process. Time-resolved transient absorption experiments confirm the charge separation following
the laser-pulse excitation of SWCNTs. Relaxation of photogenerated charge carriers in the SWCNT to the
lowest energy gap occurs in ∼1 ps.