Femtosecond Pump–Probe Spectroscopy for Organic Photovoltaic Devices

Abstract

Charge photogeneration by exciton dissociation at the donor/acceptor interface is the heart of organic molecule–based devices for solar energy conversion. Femtosecond pump–probe spectroscopy offers a noninvasive technique to follow the charge photogeneration. In this article, we elucidate the contribution of femtosecond pump–probe spectroscopy in providing in‐depth insights into various photophysical aspects that aid in the development of efficient organic molecule–based solar cells, namely, dye‐sensitized solar cells, organic–inorganic hybrid solar cells, polymer‐based bulk heterojunction solar cells, and perovskite solar cells.

Optoelectronic, femtosecond nonlinear optical properties and excited state dynamics of a triphenyl imidazole induced phthalocyanine derivative

“…These data were corrected for the coherent artifact, pump scattering, white light dispersion, and polarization etc. accompanying typical TAS data 76 by aligning the pump and probe beams at magic angle while the spectral corrections were achieved via Surface Xplorer software. Each peak maximum was fitted with multi-exponential decay fit applying to a three-level kinetic model.…”

“…Our molecule has exhibited very long-lived excited state dynamics as compared to other zinc phthalocyanines and their derivatives proving its potential in PVs (photovoltaics) and PDT. 76–80 …”

“…Our molecule has exhibited very long-lived excited state dynamics as compared to other zinc phthalocyanines and their derivatives proving its potential in PVs (photovoltaics) and PDT. [76][77][78][79][80] Fig . 13 (a) fs-TAS spectra of PBIPC at excitation wavelength 650 nm (b) 2D spectra showing the change in absorbance (color scale) of spectra with both time and wavelength.…”

Excited state absorption of DNA bases in the gas phase and in chloroform solution: a comparative quantum mechanical study

“…Pump–probe spectroscopy is the key tool to investigate fast photoinduced dynamics. 1–3 In transient absorption experiments, the excited state prepared by the pump pulse can further absorb the probe pulse, a process known as excited state absorption (ESA), which, together with the ground state bleaching and the stimulated emission, determines the observed signal. 1,2 Each excited electronic state has its characteristic ESA spectrum, making the correct interpretation of this phenomenon fundamental to disentangle the photoactivated dynamics.…”

Transient Absorption of DNA bases in the gas phase and in chloroform solution: a comparative quantum mechanical study

“…Pump-probe spectroscopy is the key tool to investigate fast photoinduced dynamics. [1][2][3] In transient absorption experiments, the excited state prepared by the pump pulse can further absorb the probe pulse, a process known as excited state absorption (ESA), which, together with the ground state bleaching and the stimulated emission, determines the observed signal. 1,2 Each excited electronic state has its characteristic ESA spectrum, making the correct interpretation of this phenomenon fundamental to disentangle the photoactivated dynamics.…”