| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 79096 | Solar Energy Materials and Solar Cells | 2012 | 6 Pages |
Excess current/capacitance behavior was observed on the Ag:Ca/P3HT:PCBM/PEDOT:PSS/ITO structure and the associated mechanism(s) were identified by performing both dc current–voltage (I–V) and ac capacitance–conductance–voltage (C/G–V) measurements in dark and light exposure, respectively. The excess current/capacitance issue, originated owing to a minority carrier injection, has manifested itself as conductivity modulation in I–V and decrease in capacitance in C–V at a sufficiently large forward bias. Satisfactory analysis in I–V as transport property and C(G)–V as storage feature were carried out on Ag:Ca/P3HT:PCBM/PEDOT:PSS/ITO structure.
► The work discusses conductivity modulation on polymer–fullerene bulk heterojunction. ► Energy band diagram and its equivalent circuit are proposed. ► Carrier conduction paths are identified. ► Equivalent capacitance and conductance terms for the proposed circuit are derived.
