TY - GEN
T1 - Ultrafast carrier dynamics in BiVO4
AU - Dringoli, Benjamin J.
AU - Butler, Keith T.
AU - Zhou, Lite
AU - Giri, Binod
AU - Rao, Pratap M.
AU - Walsh, A.
AU - Titova, Lyubov V.
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/11/28
Y1 - 2016/11/28
N2 - BiVO4 is a promising material for solar energy conversion applications. However, it suffers from low mobility due to strong carrier-phonon coupling, which favors formation of polarons. To elucidate carrier transport mechanisms in BiVO4, we apply time-resolved THz spectroscopy to probe dynamics of photexcited carriers and their coupling to lattice vibrational modes at early times (1-20 ps) after photoexcitation. We find that at high excitation fluences, trap states are saturated and a short-lived population of highly mobile residual carriers exists. At the same time, saturation of hole trap states manifests itself in changes in the low-frequency (1.92 THz) seesaw phonon mode between the Bi and VO4 units.
AB - BiVO4 is a promising material for solar energy conversion applications. However, it suffers from low mobility due to strong carrier-phonon coupling, which favors formation of polarons. To elucidate carrier transport mechanisms in BiVO4, we apply time-resolved THz spectroscopy to probe dynamics of photexcited carriers and their coupling to lattice vibrational modes at early times (1-20 ps) after photoexcitation. We find that at high excitation fluences, trap states are saturated and a short-lived population of highly mobile residual carriers exists. At the same time, saturation of hole trap states manifests itself in changes in the low-frequency (1.92 THz) seesaw phonon mode between the Bi and VO4 units.
UR - http://www.scopus.com/inward/record.url?scp=85006168224&partnerID=8YFLogxK
U2 - 10.1109/IRMMW-THz.2016.7758784
DO - 10.1109/IRMMW-THz.2016.7758784
M3 - Conference contribution
AN - SCOPUS:85006168224
T3 - International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
BT - 41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016
PB - IEEE Computer Society
Y2 - 25 September 2016 through 30 September 2016
ER -