2021 Advanced Materials (IF 30.849): PCE up to 18.82%! Application of TTDMAI in 2D DJ Perovskite Solar Cells

　　In October 2021, Advanced Materials (IF 30.849) published a study. Compared with 2D Ruddlesden-Popper perovskites, 2D Dion-Jacobson (DJ) perovskites have become an emerging photovoltaic material with excellent structure and environmental stability due to the lack of van der Waals gap. In this study, a fused-thiophene-based spacer, namely TTDMAI, is successfully developed for 2D DJ perovskite solar cells.

　　Enlitech’s Solar Simulator and QE-R Quantum Efficiency Measurement system were used in this study to assist in the measurement of experimental data. Studies have found that DJ perovskite that use TTDMA spacer with extended π-conjugation length exhibits high film quality, large crystal size, and preferred crystal vertical orientation induced by the large crystal nuclei in the precursor solution, which in turn affects the lower trap density, reduced exciton binding energy and oriented charge transport. As a result, the 2D DJ perovskite equipment optimized with TTDMA (nominal n = 4) can deliver a champion PCE up to 18.82%. The important thing is that the unencapsulated device using TTDMA can maintain average 99% of their original efficiency after being stored in N₂ for 4400 hours (more than 6 months). In addition, compared with similar 3D counterparts, thermal, heat, environmental and operational stabilities have also been significantly improved.

　　The quantum efficiency measurement system is used for EQE (external quantum efficiency) spectral analysis of perovskite solar cells. It also provides a comparison of Jsc (short-circuit current density) for the short-circuit current of solar cells under sunlight to prove the experimental results. At the same time, Enlitech’s solar simulator and KA-6000 software provide a short-term monitoring of time changes to prove the stability of the perovskite solar cell!