Annealing the active layer film (180 ☌, 10 min) prior to the deposition of the Al cathode eliminated the kink and improved performance: J sc = 4.9 mA/cm 2 V oc = 0.75 V FF = 35% and PCE = 1.3%. The improved performance is attributed to a reorganization of the blended donor and acceptor moieties in the active layer brought about by the annealing process. The elimination of the kink suggests improved electrical characteristics at the interface with the electrode and the removal of an extraction barrier. The effect of extraction and injection barriers on the shape of the J-V response and V oc has been discussed in the literature. The near square root dependence of photocurrent density with voltage and close to three-quarter power dependence on incident light intensity lead us to believe that these devices exhibit characteristics of space-charge-limited photocurrent as described by Eq.
Visit Physics New Website for Phys 101 Updates. Limitations in determining a value for the mobility of the slow carrier include not knowing the relative permittivity, and not knowing the absolute generation rate. welcome to Physics 101 Fall Semester 2023-2024 (Term 231) Announcement.
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