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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.15712 |
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| _version_ | 1866912494868496384 |
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| author | Almache-Hernándeza, Rosa Masmitjà, Gerard Pusay, Benjamín Ros, Eloi Tiwari, Kunal J. Vidal-Fuentes, Pedro Izquierdo-Roca, Victor Saucedo, Edgardo Voz, Cristóbal Puigdollers, Joaquim Ortega, Pablo |
| author_facet | Almache-Hernándeza, Rosa Masmitjà, Gerard Pusay, Benjamín Ros, Eloi Tiwari, Kunal J. Vidal-Fuentes, Pedro Izquierdo-Roca, Victor Saucedo, Edgardo Voz, Cristóbal Puigdollers, Joaquim Ortega, Pablo |
| contents | Thin-film solar cells based on kesterite (Cu2ZnSnSe4) material are a promising alternative for photovoltaic devices due to their composition consisting of earth abundant elements, ease of production at a relatively low temperatures and excellent optical absorption properties. Additionally, this absorber compound allows a tuneable bandgap energy in the 1 to 1.5 eV window range, which makes it an attractive candidate either as a top or a bottom solar cell in tandem technologies combined with transparent carrier-selective contacts. However, conventional kesterite devices use a toxic CdS layer as an electron-selective contact, resulting in the difficultto-dispose chemical waste. This work explores the use of a stack of ZnO and Al-doped ZnO (AZO) films deposited by ALD to replace the CdS-based contacts in kesterite devices. The inclusion of a polyethylenimine (PEI) interlayer as dipole to enhance the overall electrical contact performance is also discussed. The transparent back contact is formed by an ALD V2Ox thin layer over a FTO conductive electrode. Fabricated kesterite solar cells exhibit remarkable photocurrent density values of 35 mAcm-2, open-circuit voltage around 260 mV and efficiencies up to 3.5% using front illumination. The aforementioned photovoltaic parameters yield to 5.3 mAcm-2, 160 mV and 0.3% respectively under back illumination, demonstrating the bifaciality of the proposed structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_15712 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fully atomic layer deposited transparent carrier selective contacts for bifacial Cd-free Cu2ZnSnSe4 thin-film solar cells Almache-Hernándeza, Rosa Masmitjà, Gerard Pusay, Benjamín Ros, Eloi Tiwari, Kunal J. Vidal-Fuentes, Pedro Izquierdo-Roca, Victor Saucedo, Edgardo Voz, Cristóbal Puigdollers, Joaquim Ortega, Pablo Materials Science Thin-film solar cells based on kesterite (Cu2ZnSnSe4) material are a promising alternative for photovoltaic devices due to their composition consisting of earth abundant elements, ease of production at a relatively low temperatures and excellent optical absorption properties. Additionally, this absorber compound allows a tuneable bandgap energy in the 1 to 1.5 eV window range, which makes it an attractive candidate either as a top or a bottom solar cell in tandem technologies combined with transparent carrier-selective contacts. However, conventional kesterite devices use a toxic CdS layer as an electron-selective contact, resulting in the difficultto-dispose chemical waste. This work explores the use of a stack of ZnO and Al-doped ZnO (AZO) films deposited by ALD to replace the CdS-based contacts in kesterite devices. The inclusion of a polyethylenimine (PEI) interlayer as dipole to enhance the overall electrical contact performance is also discussed. The transparent back contact is formed by an ALD V2Ox thin layer over a FTO conductive electrode. Fabricated kesterite solar cells exhibit remarkable photocurrent density values of 35 mAcm-2, open-circuit voltage around 260 mV and efficiencies up to 3.5% using front illumination. The aforementioned photovoltaic parameters yield to 5.3 mAcm-2, 160 mV and 0.3% respectively under back illumination, demonstrating the bifaciality of the proposed structure. |
| title | Fully atomic layer deposited transparent carrier selective contacts for bifacial Cd-free Cu2ZnSnSe4 thin-film solar cells |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.15712 |