A Novel Hole Transport Material for Stable and Efficient Perovskite Solar Cells
Ahmed Mourtada Elseman and Mohamed M. Rashad
Electronic & Magnetic Materials Department, Advanced Materials Division,
Central Metallurgical Research and Development Institute (CMRDI), Helwan, P.O. Box 87, Cairo, 11421 Egypt
Abstract: The exploration of alternative low-cost molecular hole-transporting materials (HTMs) for both highly efficient and stable perovskite solar cells (PSCs) is a relatively new research area. Herein, we demonstrated copolymer poly(1‐(4‐hexylphenyl)‐2,5‐di(thiophene‐2‐yl)‐1H‐pyrrole) (PHDP) as hole-transporting materials (HTMs) used in perovskite solar cells (PSCs). Our new PHDP are clarified in PSCs as the ability of transport charges within the device, influence photovoltaic parameters, determine device stability, and influence its cost. The PSC based on our HTM exhibited a remarkable overall PCE of more than 20%, which is comparable to expensive spiro-MeOTAD. In addition, a well-designed PHDP suppresses the carrier recombination by facilitating the passage of holes but blocking electrons at the HTM/perovskite interface. The devices based on PHDP also obtained higher stability than that of spiro‐MeOTAD at room temperature without encapsulation. The presented results demonstrate a simple strategy for designing HTM for highly efficient and stable perovskite solar cells with low cost, which is vital for commercial application.