Interface Engineering by Thiazolium Iodide Passivation Towards Reduced Thermal Diffusion and Performance Improvement in Perovskite Solar Cells

Abstract

Interface engineering has become one of the most facile and effective approaches to improve solar cells performance and its long‐term stability and to retard unwanted side reactions. Three passivating agents are developed which can functionalize the surface and induce hydrophobicity, by employing substituted thiazolium iodide (TMI) for perovskite solar cells fabrication. The role of TMI interfacial layers in microstructure and electro‐optical properties is assessed for structural as well as transient absorption measurements. TMI treatment resulted in VOC and fill factor enhancement by reducing possible recombination paths at the perovskite/hole selective interface and by reducing the shallow as well as deep traps. These in turn allow to achieve higher performance as compared to the pristine surface. Additionally, the TMI passivated perovskite layer considerably reduces CH3NH3+ thermal diffusion and degradation induced by humidity. The un‐encapsulated perovskite solar cells employing TMI exhibit a remarkable stability under moisture levels (≈50% RH), retaining ≈95% of the initial photon current efficiency after 800 h of fabrication, paving the way towards a potential scalable endeavor.

Tetra-indole core as a dual agent: a hole selective layer that passivates defects in perovskite solar cells

“…The placement of the interfacial layer can also be advantageous in improving the charge extraction by the interface and readily lowering the non-radiative recombination in the PSCs. 53 Crystallinity of the perovskite upon the passivation by TTI was analysed by X-ray diffraction (XRD) measurement. We noted the diffraction peaks at 14.28°, 28.65° is related to the (110) and (220) planes of the perovskite crystal (Figure 5a).…”

A Machine Learning Approach for Metal Oxide Based Polymer Composites as Charge Selective Layers in Perovskite Solar Cells

“…Perovskite solar cells (PSCs) are being intensively research due to broad light absorption (300-800 nm), high absorption coefficient, long carrier diffusion length, high charge carrier mobility and tuneable bandgap. [1][2] Organic-inorganic halide PSCs have gained significant attraction due to simple fabrication process and high-power conversion efficiency (PCE). [3] The Perovskite is represented by a typical formula of ABX3, here A is an organic cation such as methylammonium (MA), formamidinium (FA), etc.…”

“…4.3 Performance MetricsR2 and Root Mean Squared Error (RMSE) are known and applicable metrics to evaluate the performance of regression models. There are some key differences between these two metrics.…”

Perovskite Passivation Strategies for Efficient and Stable Solar Cells

“…Organic-inorganic halide perovskite attracted significant research interest in the field of photoelectric conversion in recent years due to their advantages of low exciton binding energy, [1][2][3] fast carrier diffusion speed, [4][5][6] long diffusion distance, [7,8] high absorption coefficient, [9][10][11] and wide absorption window. [12,13] In just a decade, the record efficiency of perovskite solar cells (PSCs) increased from 3.8% to 25.5% from 2009 to 2020.…”