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Gu X, Shan C, Xu X, Liu Q, Kyaw AKK. Antisolvent-Free Heterogenous Nucleation Enabled by Employing 4-Tert-Butyl Pyridine Additive and Two-Step Annealing for Efficient CsPbI 2Br Perovskite Solar Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2307840. [PMID: 38054757 DOI: 10.1002/smll.202307840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 11/09/2023] [Indexed: 12/07/2023]
Abstract
All inorganic perovskite based on CsPbI2Br has attracted significant attention due to its relatively thermal stable structure compare to its hybrid counterparts. With a wide bandgap of 1.9 eV and excellent light absorption capability, it has been extensively explored for applications in indoor photovoltaics and as a front absorber in tandem devices. However, the uncontrollable crystallization process during solvent evaporation and thermal annealing leads to both macroscopic defects like cracks and microscopic defects such as voids. In this study, a metastable adduct with lead (II) halides by incorporating 4-tert-butyl pyridine as a volatile Lewis base monodentate ligand in the precursor solution is formed. The strategic preferential decomposition of the adduct during the early-stage low-temperature annealing facilitated the desorption of lead (II) halides, inducing antisolvent-free heterogenous nucleation. This, in turn, promoted crystal growth during subsequent high-temperature annealing, resulting in dense films with low defect density. As a result, a maximum open-circuit voltage of 1.30 V is achieved with the champion power conversion efficiency of 16.5% in CsPbI2Br-based perovskite solar cell. The work reveals a new mechanism of using Lewis acid-base adduct to obtain high quality perovskite films other than hindering crystallization in traditional way.
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Affiliation(s)
- Xiaoyu Gu
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electronic & Electronical Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| | - Chengwei Shan
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electronic & Electronical Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| | - Xiaowei Xu
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electronic & Electronical Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| | - Qian Liu
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electronic & Electronical Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| | - Aung Ko Ko Kyaw
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electronic & Electronical Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
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Cheng J, Gui Z, Jiang Y, Wang J, Dong J. Methanol as an anti-solvent to improve the low open-circuit voltage of CsPbBr 3 perovskite solar cells prepared with water. Dalton Trans 2024; 53:5180-5191. [PMID: 38381054 DOI: 10.1039/d3dt04192a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
CsPbBr3 has received more and more attention in the field of optoelectronic devices due to its excellent stability. To address the cost and environmental concerns associated with the use of toxic methanol, water has been explored as a substitute solvent for CsBr in the preparation of CsPbBr3 perovskite solar cells (PSCs). In this study, we utilized methanol as an anti-solvent of the CsBr/H2O solution to regulate the detrimental effects of water on the CsPbBr3 film and control the crystallization process. From results of the experiment, it was found that methanol anti-solvent treatment greatly improved the crystallization of the CsPbBr3 film, increased the grain size, and reduced the defect density. After the introduction of methanol anti-solvent treatment, the power conversion efficiency (PCE) increased from 6.09% to 7.91%, while the open-circuit voltage (Voc) increased from 1.18 V to 1.39 V. Furthermore, we incorporated 2-hydroxyethylurea into the CsPbBr3 PSCs to improve the wettability of PbBr2 towards the CsBr/H2O solution and ensure the formation of pure-phase CsPbBr3 films. The introduction of 2-hydroxyethylurea resulted in an additional increase in Voc from 1.19 V to 1.42 V. The PCE further improved from 6.56% to 8.62% after methanol anti-solvent treatment. These results demonstrate that methanol treatment effectively addresses the low Voc issue observed in CsPbBr3 PSCs prepared with water as a solvent. Importantly, this approach significantly reduces the reliance on methanol compared to conventional fabrication methods for CsPbBr3 PSCs. Overall, this work presents a promising pathway for achieving high Voc and efficiency in CsPbBr3 PSCs by utilizing water as a solvent.
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Affiliation(s)
- Jiajie Cheng
- School of Science, China University of Geosciences, Beijing, 100083, China.
| | - Zhisheng Gui
- College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
| | - Yufan Jiang
- School of Science, China University of Geosciences, Beijing, 100083, China.
| | - Jiaming Wang
- School of Science, China University of Geosciences, Beijing, 100083, China.
| | - Jingjing Dong
- School of Science, China University of Geosciences, Beijing, 100083, China.
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Zhang D, Zhang X, Guo T, Jin J, Zou J, Zhu Z, Zhou Y, Cao Q, Zhang J, Ren Z, Tai Q. Regulating the Interplay at the Buried Interface for Efficient and Stable Carbon-Based CsPbI 2Br Perovskite Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2023; 15:10897-10906. [PMID: 36786767 DOI: 10.1021/acsami.2c21792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Buried interface modification is promising for preparing high-performance perovskite solar cells (PSCs) by improving the film quality and adjusting the interfacial energy level alignment. In this work, multifunctional ethylenediaminetetraacetic acid diammonium (EAD)-modulated ZnO is employed as an effective buried interface to regulate the interplay between SnO2 and CsPbI2Br in carbon-based inorganic PSCs (C-IPSCs). The burying of EAD into the ZnO interlayer not only enhances the photoelectric properties of ZnO by passivating oxygen defects but also adjusts the energy level alignment of the buried interface. More importantly, the perovskite quality is optimized and the buried interface defects are passivated due to the formation of coordination and hydrogen bondings. Benefiting from such a robust and efficient charge transfer configuration, a maximum power conversion efficiency of 14.58% is achieved in the optimized device, which represents the highest performance reported among those of low-temperature CsPbI2Br C-IPSCs. In addition, the unencapsulated device demonstrates better long-term and thermal stability.
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Affiliation(s)
- Dan Zhang
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Xiang Zhang
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Tonghui Guo
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Junjun Jin
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Junjie Zou
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Zhenkun Zhu
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Yuan Zhou
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Qiang Cao
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Jing Zhang
- Department of Microelectronic Science and Engineering, Ningbo University, Zhejiang 315211, P. R. China
| | - Zhiwei Ren
- Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Qidong Tai
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, P. R. China
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Bahadur J, Ryu J, Pandey P, Cho S, Cho JS, Kang DW. In situ crystal reconstruction strategy-based highly efficient air-processed inorganic CsPbI 2Br perovskite photovoltaics for indoor, outdoor, and switching applications. NANOSCALE 2023; 15:3850-3863. [PMID: 36723205 DOI: 10.1039/d2nr06230e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
All-inorganic CsPbI2Br (CPIB) perovskite has gained strong attention due to their favorable optoelectronic properties for photovoltaics. However, solution-processed CPIB films suffer from poor morphology due to the rapid crystallization process, which must be resolved for desirable photovoltaic performance. We introduced phenethylammonium iodide (PEAI) as an additive into a perovskite precursor that effectively controls the crystallization kinetics to construct the preferred quality α-CPIB film under ambient conditions. Various photophysical and structural characterization studies were performed to investigate the microstructural, morphological, and optoelectronic properties of the CPIB and PEAI-assisted perovskite films. We found that PEAI plays a vital role in decreasing pinholes, ensuring precise crystal growth, enhancing the crystallinity, improving the uniformity, and tailoring the film morphology by retarding the crystallization process, resulting in an improved device performance. The device based on the optimized PEAI additive (0.8 mg) achieved a respectably high power conversion efficiency (PCE) of 17.40% compared to the CPIB perovskite solar cell (PSC; 15.75%). Moreover, the CPIB + 0.8 mg PEAI PSC retained ∼87.25% of its original PCE, whereas the CPIB device retained ∼66.90% of the initial PCE after aging in a dry box at constant heating (85 °C) over 720 h, which revealed high thermal stability. Furthermore, the indoor photovoltaic performance under light-emitting diode (LED) lighting conditions (3200 K, 1000 lux) was investigated, and the CPIB + 0.8 mg PEAI PSC showed a promising PCE of 26.73% compared to the CPIB device (19.68%). In addition, we developed a switching function by employing the optimized PSC under LED lighting conditions, demonstrating the practical application of constructed indoor PSCs.
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Affiliation(s)
- Jitendra Bahadur
- Department of Energy Systems Engineering, Chung-Ang University, Seoul, 06974 Republic of Korea.
| | - Jun Ryu
- Department of Smart Cities, Chung-Ang University, Seoul, 06974 Republic of Korea
| | - Padmini Pandey
- Department of Energy Systems Engineering, Chung-Ang University, Seoul, 06974 Republic of Korea.
| | - SungWon Cho
- Department of Smart Cities, Chung-Ang University, Seoul, 06974 Republic of Korea
| | - Jung Sang Cho
- Department of Engineering Chemistry, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju-si, Chungbuk 361-763, Republic of Korea
| | - Dong-Won Kang
- Department of Energy Systems Engineering, Chung-Ang University, Seoul, 06974 Republic of Korea.
- Department of Smart Cities, Chung-Ang University, Seoul, 06974 Republic of Korea
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Zhang D, Zhang X, Guo T, Zou J, Zhou Y, Jin J, Zhu Z, Cao Q, Zhang J, Tai Q. Small Molecules Functionalized Zinc Oxide Interlayers for High Performance Low-Temperature Carbon-Based CsPbI 2 Br Perovskite Solar Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2205604. [PMID: 36494094 DOI: 10.1002/smll.202205604] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 11/02/2022] [Indexed: 06/17/2023]
Abstract
The charge recombination resulting from bulk defects and interfacial energy level mismatch hinders the improvement of the power conversion efficiency (PCE) and stability of carbon-based inorganic perovskite solar cells (C-IPSCs). Herein, a series of small molecules including ethylenediaminetetraacetic acid (EDTA) and its derivatives (EDTA-Na and EDTA-K) are studied to functionalize the zinc oxide (ZnO) interlayers at the SnO2 /CsPbI2 Br buried interface to boost the photovoltaic performance of low-temperature C-IPSCs. This strategy can simultaneously passivate defects in ZnO and perovskite films, adjust interfacial energy level alignment, and release interfacial tensile stress, thereby improving interfacial contact, inhibiting ion migration, alleviating charge recombination, and promoting electron transport. As a result, a maximum PCE of 13.94% with a negligible hysteresis effect is obtained, which is one of the best results reported for low-temperature CsPbI2 Br C-IPSCs so far. Moreover, the optimized devices without encapsulation demonstrate greatly improved operational stability.
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Affiliation(s)
- Dan Zhang
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Xiang Zhang
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Tonghui Guo
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Junjie Zou
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Yuan Zhou
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Junjun Jin
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Zhenkun Zhu
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Qiang Cao
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
| | - Jing Zhang
- Department of Microelectronic Science and Engineering, Ningbo University, Zhejiang, 315211, P. R. China
| | - Qidong Tai
- The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China
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