Fig. 3
From: Ohmic transition at contacts key to maximizing fill factor and performance of organic solar cells
Built-in potential of organic solar cells with different hole collector work functions. Cell open-circuit voltage plotted against vacuum work function of the hole collection layer. Conditions: 1.1-sun illumination; temperature, 295 K → 30 K. For T ≲ 150 K, Voc corresponds to Vbi; for T ≲ 30 K, Vbi approaches the zero-Kelvin value Vo (0.73 V). Typical uncertainties: for large ϕ: Voc, ±0.01 V; for small ϕ: Voc, ±0.05 V. Voc data are averaged for forward and reverse sweeps
