Perovskite solar cells have emerged as a new semi-transparent PV technology for urban infrastructures that demands an explicit trade-off between power conversion efficiency (PCE) and average visible transparency (AVT) which can be adjusted by various modifications in the absorber layer. Here, we introduce a scalable and facile “one and a half” step deposition route for mixed cation perovskites patterned in a sub-micron sized grid structure for semi-transparent solar cells. The initial perovskite phase is formed in one step using a grid pattern, while the additional step involves dipping of the pre-deposited perovskite grid in a hot solution of formamidinium iodide (FAI) in isopropanol (IPA). Detailed analysis suggests that the additional step increases pore filling, crystal quality, and grain size and lowers the content of residual PbI2 as well as reveals improved photo physical properties. An average PCE ∼10% with an AVT of 28% is attained with a gold contact for the champion semi-transparent solar cell. The proposed deposition route can be generalized for all other types of perovskite based devices to yield better efficiency.
Bibliographical noteFunding Information:
M. R. would like to acknowledge the support from the National Research Foundation (NRF), Singapore, through the Singapore-HUJ Alliance for Research and Enterprise (SHARE) and Nano-materials for Energy and Water Management (NEW), NEW-CREATE Phase programme. We are also thankful to Ying Fan Tay for his help in performing XPS measurements and Dr J. M. R. Tan for his constant support and fruitful discussion during the experiments.
© The Royal Society of Chemistry.