TY - JOUR
T1 - Effect of Water Addition during Preparation on the Early-Time Photodynamics of CH3NH3PbI3 Perovskite Layers
AU - Aphrham, S.
AU - Pan, Q.
AU - Zaccarine, S. F.
AU - Felter, K. M.
AU - Thieme, J.
AU - van den Nieuwenhuijzen, K. J.H.
AU - ten Elshof, J. E.
AU - Huijser, A.
PY - 2017/12/6
Y1 - 2017/12/6
N2 - The effect of water addition during preparation of a CH3NH3PbI3 layer on the photodynamics is studied by femtosecond transient absorption. Both the regular perovskite and the aqueous analogue show charge thermalisation on a timescale of about 500 fs. This process is, however, less pronounced in the latter layer. The spectral feature associated with hot charges does not fully decay on this timescale, but also shows a long-lived (sub-ns) component. As water molecules may interfere with the hydrogen bonding between the CH3NH3 + cations and the inorganic cage, this effect is possibly caused by immobilisation of cation motion, suggesting a key role of CH3NH3 + dipole reorientation in charge thermalisation. This effect shows the possibility of controlling hot charge carrier cooling to overcome the Shockley–Queisser limit.
AB - The effect of water addition during preparation of a CH3NH3PbI3 layer on the photodynamics is studied by femtosecond transient absorption. Both the regular perovskite and the aqueous analogue show charge thermalisation on a timescale of about 500 fs. This process is, however, less pronounced in the latter layer. The spectral feature associated with hot charges does not fully decay on this timescale, but also shows a long-lived (sub-ns) component. As water molecules may interfere with the hydrogen bonding between the CH3NH3 + cations and the inorganic cage, this effect is possibly caused by immobilisation of cation motion, suggesting a key role of CH3NH3 + dipole reorientation in charge thermalisation. This effect shows the possibility of controlling hot charge carrier cooling to overcome the Shockley–Queisser limit.
KW - cation immobilisation
KW - hybrid perovskites
KW - photodynamics
KW - transient absorption
KW - water addition
UR - http://www.scopus.com/inward/record.url?scp=85031724228&partnerID=8YFLogxK
U2 - 10.1002/cphc.201700896
DO - 10.1002/cphc.201700896
M3 - Article
AN - SCOPUS:85031724228
SN - 1439-4235
VL - 18
SP - 3320
EP - 3324
JO - ChemPhysChem: a European journal of chemical physics and physical chemistry
JF - ChemPhysChem: a European journal of chemical physics and physical chemistry
IS - 23
ER -