Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells.

ABSTRACT: 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 d

SUBMITTER: Jimenez-Lopez J 

PROVIDER: S-EPMC5522453 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature