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Abstract
The efficiencies of perovskite solar cells (PSCs) are now reaching such consistently high levels that scalable manufacturing at low cost is becoming critical. However, this remains challenging due to the expensive hole-transporting materials usually employed, and difficulties associated with the scalable deposition of other functional layers. By simplifying the device architecture, hole-transport-layer-free PSCs with improved photovoltaic performance are fabricated via a scalable doctor-blading process. Molecular doping of halide perovskite films improved the conductivity of the films and their electronic contact with the conductive substrate, resulting in a reduced series resistance. It facilitates the extraction of photoexcited holes from perovskite directly to the conductive substrate. The bladed hole-transport-layer-free PSCs showed a stabilized power conversion efficiency above 20.0%. This work represents a significant step towards the scalable, cost-effective manufacturing of PSCs with both high performance and simple fabrication processes.
Highlights
The efficiencies of perovskite solar cells (PSCs) are reaching such consistently high levels that scalable manufacturing at low cost is becoming critical
MAPbI3 precursor dissolved in N,N-diethylformamide (DMF) containing ptype dopant (F4TCNQ) was dripped onto substrates which were heated at 150 °C, followed by a quick blading process to spread the solution onto the substrates
To implement molecular doping of the perovskite layer, F4TCNQ with chemical structure shown in Fig. 1a was dissolved in DMF separately, and added to the as-prepared MAPbI3 precursor solution
Summary
The efficiencies of perovskite solar cells (PSCs) are reaching such consistently high levels that scalable manufacturing at low cost is becoming critical This remains challenging due to the expensive hole-transporting materials usually employed, and difficulties associated with the scalable deposition of other functional layers. By simplifying the device architecture, hole-transport-layer-free PSCs with improved photovoltaic performance are fabricated via a scalable doctor-blading process. This work represents a significant step towards the scalable, cost-effective manufacturing of PSCs with both high performance and simple fabrication processes Since their first report in 2009, halide perovskite solar cells (PSCs) have attracted enormous interest as emerging lightto-electricity conversion optoelectronic devices with both high efficiency and ease of solution processability[1,2,3]. By employing a bladed and doped MAPbI3 film as the photoactive layer in a HTL-free device structure, a stabilized PCE over 20.0% with almost no J–V hysteresis is obtained
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