Numerical modelisation of ZnO interfacial layer on P3HT:PCBM based organic photovoltaic bulk heterojunction devices

The role of a highly optimized approach with superior transparent conductive oxide anode towards efficient organic solar cell

“…The positive correlation between TCO thickness and J SC is shown in figure 2(a), whereas J SC primarily increases with TCO thickness up to 70 nm, after which J SC decreases slightly as transparency decreases and more absorption occurs, as reported by Sen et al [30]. In distinct terms, the sheet resistance of TCOs is inversely proportional to film thickness and directly proportional to transparency, both of which are associated with the geometrical attributes of the proposed OSC device [31,32]. The PCE increased up to 70 nm thickness of TCO for lower sheet resistance and higher transparency, inflicting minimal parasitic effect engagement in the OSC, as illustrated by figure 2(b).…”

“…One plausible issue is that the most common anode material used in OSC is a transparent conductive oxide (TCO), which is expensive to produce and has some undesirable features [30]. By substituting environmentally acceptable and low-cost processing oxides with superior properties for the TCO, these consequences can be mitigated [31] . The outcome of appropriate TCOs is important since it also affects extraction and aids in the immediate flow of photons from the anode to the OAL for photo generation.…”

“…The input material parameters used in the P 3 HT: PC 61 BM OSC device is based on previously tested values for the various consecutive layers. Here the symbols used for parameters are thickness (W), bandgap (E g ), relative permittivity (ε r ), electron affinity (χ i ), electron mobility (μ n ), hole mobility (μ p ), effective DOS at CB (N C ), effective DOS at VB (N V ), electron trap density (N e exp ), hole trap density (N h exp ), electron tail slope (N n U ), hole tail slope (N h U ), respectively[8][9][10][11][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Performance of OAL thickness with variable TCO in OSC After the optimization of TCO's thickness, the maximum value of device parameters would be achieved through the optimum thickness of OAL.…”