Wide-bandgap (WBG) perovskite solar cells (PSCs) hold significant promise for various applications. However, issues such as substantial open-circuit voltage (VOC) deficit and halide phase separation have hindered their rapid development. Herein, additive engineering was utilized by introducing the multifunctional additive 2- (trifluoromethanesulfonyl)aminoethyl methacrylate (TFSMA) into the WBG perovskite absorber layer, leading to a significant enhanced VOC and operational stability in corresponding PSCs. Sulfonic acid groups of TFSMA interact with the uncoordinated lead ions (Pb2+) and halide vacancies, thereby suppressing non-radiative recombination. Additionally, the highly electronegative fluorine ions (F- ) effectively inhibit phase separation, enhancing film stability under rigorous conditions. Ultimately, the 1.77 eV WBG PSC achieved a conversion efficiency of 18.28% with VOC of 1.304 V. Moreover, the encapsulated PSC maintained 93% of its initial efficiency after continuous operation for 200 hours under 1 sun illumination.
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.
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