Unraveling the Characteristic Shape for Magnetic Field Effects in Polymer-Fullerene Solar Cells.

ABSTRACT: Spin-dependent effects in organic solar cells (OSCs) are responsible for tuning the electric current when an external magnetic field is applied. Here, we report the magnetic field effect (MFE) on wide-bandgap (WBG) solar cells based on the polymers PBDT(O)-T1 and PBDT(Se)-T1 blended with PC₇₀BM. Furthermore, we propose an experimental method based on the electrical transport (i-V) measurements to unveil the negative magneto conductance (MC) at small bias. The observed curves in a double-logarithmic scale display a particular S-like shape, independent of the OSC power conversion efficiency (PCE) or MC amplitudes. Additionally, from the slope of the S-like shape curve, it is possible to identify the fullerene concentrations that would result in the minimum MC and the

SUBMITTER: Cabero Zabalaga MA 

PROVIDER: S-EPMC6645333 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature