Abstract
Hole conductor-free, fully printable mesoscopic perovskite solar cells with carbon electrode (PM-PSCs) have a good commercialization prospect because of low-cost production and high power conversion efficiency (PCE). Currently, the problem of improving the stability of perovskite solar cells (PSCs) is very important for commercialization. Interfacial engineering using polymers is an effective method to improve the efficiency and stability of PSCs. We prepared PM-PSCs by treatment with the toluene solution containing polystyrene (PS) on the carbon electrode of the PM-PSCs, which would improve the charge transfer and greatly suppressed charge recombination in PS treated PM-PSCs, and also could greatly prevent degradation of perovskite into PbI2. The PS treated PM-PSCs showed higher stability to light and moisture than the control, and the PCE was improved from 11.31% (control) to 14.03%.
Highlights
The development and use of clean and renewable energy resources is important to solve the energy production by fossil fuels, the environmental pollution resulting from them, global warming problems and to meet future energy needs
Jscs of PM-perovskite solar cells (PSCs)/PS-0.5, PM-PSCs/PS-1, and PM-PSCs/PS-1.5 were not significantly different, but differences were observed in Voc and fill factor (FF), and the Voc and FF of PM-PSCs/PS-1 were the highest among them
The improvement of power conversion efficiency (PCE) in PM-PSCs/PS-1 is may be due to the reduced charge recombination and facilitated charge transfer at the interfaces of PM-PSCs [31]
Summary
The development and use of clean and renewable energy resources is important to solve the energy production by fossil fuels, the environmental pollution resulting from them, global warming problems and to meet future energy needs. Poly(3,4-ethylene dioxithiophene:polystyrene sulfate) (PEDOT:PSS), an organic semiconductor that functions as hole transporter in PSCs, contains a PS polymer, which is considered an excellent material that forms a mechanically robust hole transporter layer, and reduces the use of conjugated polymers to increase stability [31]. This hydrophobic PS can greatly improve the stability of perovskite solar cells by preventing the corrosion of perovskite without reducing the photoelectric properties of perovskite. In photostability test of maximum power-point tracking under 100h continuous illumination of 1sun intensity at 25°C and 60% of humidity, the PCE of PS-treated PM-PSCs without encapsulation was retained 90% of the initial PCE
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