Journal
ENERGY & FUELS
Volume 36, Issue 21, Pages 13187-13194Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.2c02878
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Hole transport material-free perovskite solar cells (HFPSCs) can be improved in stability and efficiency by adding malonic acid (MA), which increases crystallinity and reduces charge recombination and trap density. The MA-modified perovskite layer also has better water repellency and higher shelf stability.
Hole transport material-free perovskite solar cells (HFPSCs) offer low-cost photovoltaic devices. For development and commercialization, they are more attractive than the expensive HTLcontained perovskite solar cells. Herein, we focused on enhancing the stability and efficiency of HF-PSCs with the malonic acid (MA) addition to the methylammonium lead iodide. The introduced additive increases the perovskite crystallinity and assembles a perovskite layer with larger grains along with fewer surface defects. In addition, the MA-modified HF-PSCs show suppressed charge recombination within devices, and a lower charge trap density has been obtained for them. A considerable power conversion efficiency of 14.14% is achieved for MA-modified HF-PSCs, higher than the performance of 11.88% for the untreated HF-PSCs. Finally, MA-based HF-PSCs show higher shelf stability than the control HF-PSCs. It is because the MA-modified perovskite layer with passivated grain boundaries is better at repelling water.
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