Taurine modified hole transport layers for efficient low-bandgap perovskite solar cells

Huayang Wang; Tianshu Ma; Yuhui Liu; Changlei Wang

doi:10.1117/12.2684547

31 May 2023 Taurine modified hole transport layers for efficient low-bandgap perovskite solar cells

Huayang Wang, Tianshu Ma, Yuhui Liu, Changlei Wang

Proceedings Volume 12711, Third Optics Frontier Conference (OFS 2023); 127110M (2023) https://doi.org/10.1117/12.2684547
Event: Third Optics Frontier Conference (OFS 2023), 2023, Fuyang, China

Abstract

All-perovskite tandem solar cells (TSCs) show an effective way to overcome the efficiency limit of single-junction perovskite solar cells (PSCs). Low-bandgap mixed tin-lead perovskite bottom subcell is a critical component in all perovskite TSCs, which are currently limited by the relatively low efficiency and poor stability of the bottom subcells. Here in this work, we use multifunctional taurine material to dope and modify the PEDOT:PSS hole transport layer (HTL) for better optical transmittance and charge transporting properties, enabling efficient low-bandgap PSCs with highly improved open circuit voltages and short circuit current densities. Taurine has a suitable refractive index to reduce light reflection loss when introduced at the interface of PEDOT:PSS/perovskite film. Moreover, taurine improves the energy level alignments and facilitates charge transfer dynamics in the low-bandgap PSCs when doped into the PEDOT:PSS HTL. Finally, the synergistic effects of the interface modification and bulk doping of PEDOT:PSS with taurine leads to significantly enhanced efficiencies of over 22% and 26% for low-bandgap PSCs and all-perovskite TSCs, respectively.

Citation Download Citation

Huayang Wang, Tianshu Ma, Yuhui Liu, and Changlei Wang "Taurine modified hole transport layers for efficient low-bandgap perovskite solar cells", Proc. SPIE 12711, Third Optics Frontier Conference (OFS 2023), 127110M (31 May 2023); https://doi.org/10.1117/12.2684547

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KEYWORDS

Perovskite

Magnesium

Doping

External quantum efficiency

Interfaces

Scanning electron microscopy

Solar cells

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