Atomic Layer Deposition of an Effective Interface Layer of TiN for Efficient and Hysteresis-Free Mesoscopic Perovskite Solar Cells

Abstract

Perovskite solar cells (PSCs) have experienced outstanding advances in power conversion efficiencies (PCEs) by employing new electron transport layers (ETLs), interface engineering, optimizing perovskite morphology, and improving charge collection efficiency. In this work, we study the role of a new ultrathin interface layer of titanium nitride (TiN) conformally deposited on a mesoporous TiO2 (mp-TiO2) scaffold using the atomic layer deposition method. Our characterization results revealed that the presence of TiN at the ETL/perovskite interface improves the charge collection as well as reduces the interface recombination. We find that the morphology (grain size) and optical properties of the perovskite film deposited on the optimized mp-TiO2/TiN ETL are improved drastically, leading to devices with a maximum PCE of 19.38% and a high open-circuit voltage (V oc) of 1.148 V with negligible hysteresis and improved environmental (∼40% RH) and thermal (80 °C) stabilities.

Laser-Scribing Optimization for Sprayed SnO2-Based Perovskite Solar Modules on Flexible Plastic Substrates

“…It is important to remark that not only the optical and electrical properties are important in defining the quality of the ETL in perovskite solar cells but also the ETL influence on the morphology of the perovskite film, which is grown on the top of the SnO 2 layer. The vast literature has been devoted to the understanding of the effect of the perovskite film quality on the performances on solar cells, with the morphology being one of the most impacting properties. ,− Therefore, we conducted SEM investigation to verify if the perovskite crystallization is affected by the SnO 2 deposition technique. The SEM images of the perovskite layer on spray-coated and spin-coated SnO 2 films are shown in Figure .…”

Tailoring organic bulk-heterojunction for charge extraction and spectral absorption in CsPbBr3 perovskite solar cells

“…As shown in Fig. 2c, the FTO/c-TiO 2 /m-TiO 2 /CsPbBr 3 /P3HT film demonstrates significant PL quenching at 537 nm in comparison with that of FTO/c-TiO 2 /m-TiO 2 /CsPbBr 3 film, which can be associated with the efficient hole extraction ability of P3HT from the perovskite [40,41]. The highest PL quenching is observed upon introducing the PCBM into the BHJ layer because partial electrons transfer to PCBM from perovskite for a reduced charge radiative recombination.…”

Two-dimensional halide perovskite single crystals: principles and promises

“…Over the course of time, the certified power conversion efficiency (PCE) of perovskite solar cells (PSCs) has reached to 25.5% [2], which is comparable to the technologies based on CIGS, GaAs and silicon. As a result, significant efforts have been made for the commercialization of MHPbased devices using interface engineering [3], compositional and crystal engineering [4], surface passivation [5] and band alignment engineering [6]. This success stems from their obvious properties such as high absorption coefficient [7], tuneable band gap [8], sufficiently long carrier diffusion lengths [9] and easy solution processibility [10].…”