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2017 ; 7
(1
): 6101
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Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in
Perovskite Solar Cells
#MMPMID28733664
Jiménez-López J
; Cambarau W
; Cabau L
; Palomares E
Sci Rep
2017[Jul]; 7
(1
): 6101
PMID28733664
show ga
We present a comparative study between a series of well-known semiconductor
polymers, used in efficient organic solar cells as hole transport materials
(HTM), and the state-of-the art material used as hole transport material in
perovskite solar cells: the spiro-OMeTAD. The observed differences in solar cell
efficiencies are studied in depth using advanced photoinduced spectroscopic
techniques under working illumination conditions. We have observed that there is
no correlation between the highest occupied molecular orbital (HOMO) energy
levels of the organic semiconductors and the measured open-circuit voltage
(V(OC)). For instance, spiro-OMeTAD and P3HT have a comparable HOMO level of
~5.2?eV vs vacuum even though a difference in V(OC) of around 200?mV is recorded.
This difference is in good agreement with the shift observed for the charge vs
voltage measurements. Moreover, hole transfer from the perovskite to the HTM,
estimated qualitatively from fluorescence quenching and emission lifetime, seems
less efficient for the polymeric HTMs. Finally, the recombination currents from
all devices were estimated by using the measured charge (calculated using
photoinduced differential charging) and the carriers' lifetime and their value
resulted in accordance with the registered short-circuit currents (J(SC)) at 1
sun.