Abstract
A study on efficient perovskite solar cells (PSCs) utilizing non-peripherally substituted octahexyltetrabenzotriazaporphyrin (C6TBTAPH2) hole transporting material (HTM) was demonstrated through fabrication, characterization, and simulation. C6TBTAPH2 semiconductor possesses a compatible energy band diagram (highest occupied molecular orbital energy levels of 5.17 eV and energy band gap of 1.59 eV) and a relatively high charge carrier mobility for a potential HTM in PSC. The simulated PSCs (using solar cell capacitance simulator – one dimensional programs) with C6TBTAPH2 HTMs exhibited the relatively high photovoltaic performance with power conversion efficiencies (PCEs) of 19.5%, but there existed a gap between the simulated and experimental data. Those differences were in part due to the low acceptor density of the pristine and/or p-type doped C6TBTAPH2 HTM and the parallel alignment of C6TBTAPH2 molecules on glass substrates. We suggest that C6TBTAPH2 semiconductor could be a potential HTM in PSC if the indications from the simulated results are well dealt with.
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