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16. Exceeding 23% Efficiency for 3D/3D Bilayer Perovskite Heterojunction MAPbI3/FAPbI3‐Based Hybrid Perovskite Solar Cells with Enhanced Stability.

Author

Patil, Jyoti V., Mali, Sawanta S., and Hong, Chang Kook

Subjects
*HYBRID solar cells, *ENERGY levels (Quantum mechanics), *LEAD iodide, *HETEROJUNCTIONS, *THERMAL stability, *PHOTOVOLTAIC power systems, *PEROVSKITE
Abstract

Organic–inorganic hybrid perovskite solar cells (HPSCs) are gaining attention as a promising technology for next‐generation photovoltaic devices owing to their impressive power conversion efficiency (PCE) and cost‐effective fabrication methods. Although, solution‐processed passivation using 2D perovskites can improve the interface recombination, this approach hampers its effective charge transportation. In this study, the study investigates the properties and performance of the bilayer 3D/3D methylammonium lead iodide (MAPbI3)/formamidinium lead iodide (FAPbI3)‐based perovskite heterojunction (BPHJ) to address these concerns. The bilayer structure consists of two distinct perovskite absorbers having independent structure that are sandwiched between two charge transporting layer (CTLs) to make functional device. First, the fabrication process is optimized to achieve high‐quality MAPbI3 perovskite films with controlled morphology and crystallinity followed by the formation of BPHJ using FAPbI3 deposition by thermal evaporation technique. The BPHJ‐160 nm‐based PSCs with optimized parameters exhibit an enhanced PCE of 23.08% compared to single‐layer reference (20.15%) device. The improved performance can be attributed to the effective charge extraction at the heterojunction interface and reduced charge recombination losses due to favorable energy levels. Furthermore, the long‐term stability of the BPHJ‐based perovskite device is assessed under continuous illumination along with its ambient and thermal stability across different environmental conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Tailoring Interface via Tuning the Phase and Morphology of TiO2for Efficient Mesoporous Perovskite Solar Cells

Author

Rahane, Ganesh K., Singh, Balpartap, Roy, Anurag, Saykar, Nilesh G., Mandal, Animesh, Afria, Dikshant, Jadhav, Yogesh A., Mali, Sawanta S., Dzade, Nelson Y., and Rondiya, Sachin R.

Abstract

The efficiency of mesoporous perovskite solar cells (mp-PSCs) is significantly influenced by favorable charge transport properties across their various interfaces. The interfaces involving compact-TiO2, mesoporous electron transport layer (ETL), and perovskite layer are particularly vital for high-performing devices. Our study presents a combined experimental and computational approach, specifically employing density functional theory, to explore the impact of mesoporous-ETL/perovskite interface properties on carrier transport. These properties are examined in relation to the phases and morphologies of the mesoporous layer. Different phases of TiO2, including anatase, rutile, and brookite, and various morphologies such as nanocubes, nanorods, and disks/clusters, were synthesized using a simple hydrothermal synthesis route. They constitute the mesoporous layer, and Cs0.05FA0.84MA0.14PbI2.55Br0.45is used as the perovskite absorber in mp-PSCs. The performance of the resulting mesoporous-TiO2(mp-TiO2) device was investigated in relation to the different phases and morphologies of mp-TiO2. The mp-PSCs with the anatase phase as the mesoporous ETL exhibited the highest device parameters, including power conversion efficiency of 19.15%, short-circuit current density of 22.55 mA/cm2, fill factor of 76.50%, and open-circuit voltage of 1.11 V. The superior performance of the anatase structure is attributed to its promising band edge alignment, which results from a small negative conduction band offset compared to other phases, thereby enhancing carrier transport. This study underscores the potential of interface optimization to improve device performance. By investigating the device performance across different phases and morphologies of the mp-TiO2layer, we can pave the way for the design of next-generation energy devices.

Published
2024
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30. Oxygen-Mediated (0D) Cs4PbX6 Formation during Open-Air Thermal Processing Improves Inorganic Perovskite Solar Cell Performance.

Author

Saha, Rafikul Ali, Chiu, Wei-Hsun, Degutis, Giedrius, Chen, Peng, Filez, Matthias, Solano, Eduardo, Orlov, Nikolai, De Angelis, Francesco, Ariza, Rocío, Meneghini, Carlo, Detavernier, Christophe, Mali, Sawanta S., Hoang, Minh Tam, Yang, Yang, Garnett, Erik C., Wang, Lianzhou, Wang, Hongxia, Roeffaers, Maarten B. J., and Steele, Julian A.

Published
2024
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45. W18O49Nanofibers Functionalized with Graphene as a Selective Sensing of NO2Gas at Room Temperature

Author

Tiwari, Manish Kumar, Kanwade, Archana R., Rajore, Shraddha M., Satrughna, Jena Akash Kumar, Ito, Yuta, Lee, Hyunju, Ohshita, Yoshio, Ogura, Atsushi, Mali, Sawanta S., Patil, Jyoti V., Hong, Chang Kook, and Shirage, Parasharam M.

Abstract

Recent trends in two-dimensional (2D) graphene have demonstrated significant potential for gas-sensing applications with significantly enhanced sensitivity even at room temperature. Herein, this study presents fabrication of distinctive gas sensor based on one-dimensional (1D) W18O49nanofibers decorated 2D graphene, specifically coated on copper (Cu)-based interdigitated electrodes formed by DC sputtering, which can selectively detect NO2gas at room temperature. The sensor device fabricated using W18O49/Gr1.5% (i.e., W18O49nanofibers hybrid nanocomposite with 1.5 wt % graphene) displays excellent overall sensing performance at 27 °C (room temperature) with high response (∼150–160 times) to NO2gas. The W18O49/Gr1.5%-based sensor device reflects the highly selective detection toward NO2gas among various gases with quick response time of 3 s and speedy recovery in 6 s. The limit of detection of ∼0.3 ppm with excellent reproducibility and stability for 3 months in all weather conditions (tested in humidity conditions 20–97%) are superior features of the device under test. However, W18O49/Gr3% displayed higher selectivity for NO2but resulted with comparatively reduced sensitivity than W18O49/Gr1.5% sensor. The enhanced sensing performance could be attributed to the graphene content to decorate the nanofibers on it, oxygen vacancies/defects, and the contacts between the sensing material and Cu. This favorable synthesis and properties of self-assembled hybrid composite materials provide a potential utilization for detecting NO2gas in environmental safety inspection.

Published
2024
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46. Oxygen-Mediated (0D) Cs4PbX6Formation during Open-Air Thermal Processing Improves Inorganic Perovskite Solar Cell Performance

Author

Saha, Rafikul Ali, Chiu, Wei-Hsun, Degutis, Giedrius, Chen, Peng, Filez, Matthias, Solano, Eduardo, Orlov, Nikolai, De Angelis, Francesco, Ariza, Rocío, Meneghini, Carlo, Detavernier, Christophe, Mali, Sawanta S., Hoang, Minh Tam, Yang, Yang, Garnett, Erik C., Wang, Lianzhou, Wang, Hongxia, Roeffaers, Maarten B. J., and Steele, Julian A.

Abstract

The desire to commercialize perovskite solar cells continues to mount, motivating the development of scalable production. Evaluations of the impact of open-air processing have revealed a variety of physical changes in the fabricated devices─with few changes having the capacity to be functionalized. Here, we highlight the beneficial role of ambient oxygen during the open-air thermal processing of metastable γ-CsPbI3-based perovskite thin films and devices. Physiochemical-sensitive probes elucidate oxygen intercalation and the formation of Pb–O bonds in the CsPbI3crystal, entering via iodine vacancies at the surface, creating superoxide (O2–) through electron transfer reactions with molecular oxygen, which drives the formation of a zero-dimensional Cs4PbI6capping layer during annealing (>330 °C). The chemical conversion permanently alters the film structure, helping to shield the subsurface perovskite from moisture and introduces lattice anchoring sites, stabilizing otherwise unstable γ-CsPbI3films. This functional modification is demonstrated in γ-CsPbI2Br perovskite solar cells, boosting the operational stability and photoconversion efficiency of champion devices from 12.7 to 15.4% when annealed in dry air. Such findings prompt a reconsideration of glovebox-based perovskite solar cell research and establish a scenario where device fabrication can in fact greatly benefit from ambient oxygen.

Published
2024
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47. Revealing the potential of graphene-embedded Na3Fe2(PO4)3 for enhanced sodium-ion battery performance.

Author

Kanwade, Archana R., Jena, Akash Kumar Satrughna, Rajore, Shraddha M., Mali, Sawanta S., Patil, Jyoti V., Hong, Chang Kook, and Shirage, Parasharam M.

Subjects
SODIUM phosphates, SOL-gel processes, ENERGY storage, NANOCOMPOSITE materials, GRAPHENE, SODIUM ions, ELECTRIC batteries
Abstract

In this study, pure sodium iron phosphate [Na3Fe2(PO4)3, abbreviated NFP] and graphene-embedded sodium iron phosphate [Na3Fe2(PO4)3/graphene, abbreviated NFP/G] were effectively produced through a facile sol–gel method followed by physicochemical and electrochemical characterization for sodium-ion batteries. The resulting NFP nanoplates exhibited an even distribution and firm attachment to the graphene sheets of the NFP/G nanocomposite. The nanocomposite displayed superior sodium storage capacity, achieving 115.1 mAh g−1 at a 0.1 C rate, closely approximating the theoretical capacity of pure NFP. As a SIBs cathode, NFP/G stands out for its exceptionally long cycle life and high capacity. It surpasses the capacity of pure NFP, and its derivatives studied at these charge/discharge rates, delivering high capacities of 103.7 mAh g−1 (96.4%) and 86.8 mAh g−1 (93.7%) after 50 and 500 cycles at 0.5 C and 1 C, respectively. The interaction between the NFP nanoplates evenly distributed on the graphene sheets established active sites, promoting the fast and efficient diffusion of sodium ions, leading to reduced diffusion lengths and enhanced electronic conductivity. These results emphasize the promising potential of these nanocomposites for sodium-ion energy storage applications. [ABSTRACT FROM AUTHOR]

Published
2024
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