2021 Adv. Funct. Mater. (IF 18.808): Overcoming Voltage Loss of Quasi-Two-Dimensional Perovskite Solar Cells! Application of Thermal Aging Precursor Solutions
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Advance Functional Materials (IF 18.808) published a study in September 2021. Although the power conversion efficiency (PCE) of 3D perovskite solar cell (PSC) has increased to 25.5%, its poor device stability is not conducive to commercialization. Ruddlesden-Popper quasi-2D perovskites are expected to become candidates to replace traditional 3D perovskites due to the high materials stability and tunability. However, quasi-2D PSCs have the problem of high voltage loss, which cause PCE to still lag those of 3D PSCs. Here, the research team use thermal-aged precursor solutions (TAPSs) to reduce the voltage loss in quasi-2D PSCs.
Enlitech’s solar simulator, QE-R Quantum Efficiency Measurement system, Fourier Transform Photocurrent System (FTPS) and other instruments were used in this study to assist in the measurement. It is found that based on the (AA)2MA4Pb5I16 (n=5) quasi-2D perovskite absorber with a bandgap of≈1.60 eV, a record-high open-circuit voltage of 1.24V is obtained and the PCE is increased to 18.68%.
(a) Sketched device architecture of perovskite solar cells with a p–i–n structure used in this study.
Photovoltaic parameters of the best (AA)2MA4Pb5I16 solar cells prepared with FPS and TAPS.
Through clarifying relationship between the device performance and film quality, it is found that the reduced nonradiative recombination loss, ΔVOC, and nonrad is essential for enhancing of VOC and improving PCE. Mechanistically, treatment with thermally aged solution processing can favorably induce colloid aggregations to reduce the amount of nucleation sites. Finally, a high-quality quasi- 2D perovskite films with compact morphology, preferential crystal orientation and lowered trap density can be achieved. It is also important that with the improvement of film quality, the thermal stability of quasi-2D PSCs could be significantly improved, which are mainly due to the minimized corrosion of the Ag electrodes with inhibited ion migration. This research opens up a new processing approach that can realize efficient and stable perovskite photovoltaic devices toward realistic energy conversion applications.
In addition to the EQE (External Quantum Efficiency) spectrum analysis of solar cells, the Quantum Efficiency Measurement System of Enlitech also provides Jsc (short-circuit current density) comparison for the short-circuit current of solar cells under the solar simulator to prove the authenticity of the experiment. The solar simulator and KA-6000 software of Enlitech also provide monitoring of the short-circuit current over time to prove the stability of the solar cell!
(a) Irradiation intensity dependent Voc characteristics of FPS- and TAPS-based solar cells. (b) EQE of electroluminescence measured on the FPS/TAPS-based solar cells. Inset: EL image of the TAPS-based solar cell operated in the forward bias regime.
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Keywords: quasi-2D perovskite solar cell, hermal-aged precursor solution, voltage loss, Solar Simulator, Quantum Efficiency, FTPS, Sun Simulator
Article link: https://doi.org/10.1002/adfm.202107675
