Journal article
Performance improvement of dye-sensitized double perovskite solar cells by adding Ti3C2Tx MXene
Chemical engineering journal (Lausanne, Switzerland : 1996), v 446
15 Oct 2022
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Abstract
Ti3C2Tx MXene was doped into Cs2AgBiBr6 perovskite layer based on D149 indoline dye-sensitized TiO2 to enhance its crystallinity, absorption intensity and carrier mobility, leading to high power conversion efficiencies of 4.47 % under 1 sun illumination and 7.23 % under 200 lx indoor light illumination with better stability for Cs2AgBiBr6 double perovskite solar cells.
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•Ti3C2Tx enhances the crystallization of Cs2AgBiBr6 and offers better mobility.•Ti3C2Tx can adjust the valence band of Cs2AgBiBr6 through the Fermi level.•High PCE of 4.47% under 1 sun illumination with enhanced stability was achieved.•High PCE of 7.23 % under 200 lx indoor light illumination was achieved.
Cs2AgBiBr6 is considered an emerging candidate for lead-free inorganic double perovskite solar cells (PSCs). However, the photovoltaic performance of Cs2AgBiBr6 is restricted while the reported power conversion efficiencies (PCEs) are almost lower than 3%. Here, we employed D149 indoline dye to sensitize the TiO2 electron transport layer (ETL) and introduced Ti3C2Tx MXene nanosheets into Cs2AgBiBr6 to enhance its crystallization. Both Cs2AgBiBr6 and D149 indoline dye could contribute to the photocurrent. Moreover, the calculations of the interface properties and electron structure were carried out based on density functional theory. Weak van der Waals forces between the interfaces of Cs2AgBiBr6 and Ti3C2Tx allow the perovskite to retain its semiconductor properties, while effectively weaken the Fermi level pinning (FLP). The high work function of Ti3C2Tx adjusts the valence band of Cs2AgBiBr6 through the Fermi level to improve carrier mobility. As a result, PCEs of 4.47 % under 1 sun illumination and 7.23 % under 200 lx indoor light illumination with enhanced long-term stability were achieved. Hence, this work demonstrates the great potential of Ti3C2Tx for double PSCs and predicts other MXenes with higher work function for further applications.
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Details
- Title
- Performance improvement of dye-sensitized double perovskite solar cells by adding Ti3C2Tx MXene
- Creators
- Lin Yang - Jilin UniversityPengfei Hou - Jilin UniversityBaoning Wang - Jilin UniversityChunxiang Dall'Agnese - Jilin UniversityYohan Dall'Agnese - University College LondonGang Chen - Jilin UniversityYury Gogotsi - Drexel UniversityXing Meng - Jilin UniversityXiao-Feng Wang - Jilin University
- Publication Details
- Chemical engineering journal (Lausanne, Switzerland : 1996), v 446
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000801683400003
- Scopus ID
- 2-s2.0-85130317022
- Other Identifier
- 991019167597904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Engineering, Chemical
- Engineering, Environmental