Application of Bifacial Semitransparent CuInSe2 Absorber to the Bottom Cell in Bifacial Semitransparent Perovskite/CuInSe2 Tandem Solar Cell for Albedo Environment

Although various types of bifacial solar cells exist, few studies have been conducted on bifacial semitransparent CuInSe2 solar cells (BS‐CISe SCs) despite the attractive potential in power generation from both sides in an albedo environment. The optimized BS‐CISe SCs with 300 and 800 nm‐thick absor...

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Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-03, Vol.20 (9), p.e2305796-n/a
Main Authors: An, Jin Gi, Tran, Huyen, Kim, Dongryeol, Lee, Sang Min, Lee, Ahreum, Ahn, Seung Kyu, Cho, Jun‐Sik, Gwak, Jihye, Kim, TaeWan, Jeong, Inyoung, Park, Joo Hyung
Format: Article
Language:English
Subjects:
Absorbers
Albedo
albedo effect
bifacial semitransparent solar cells
bifacial semitransparent tandem solar cells
Copper indium selenides
CuInSe2
Energy conversion efficiency
Illumination
perovskite
Perovskites
Photovoltaic cells
Polyvinyl carbazole
Solar cells
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Summary:Although various types of bifacial solar cells exist, few studies have been conducted on bifacial semitransparent CuInSe2 solar cells (BS‐CISe SCs) despite the attractive potential in power generation from both sides in an albedo environment. The optimized BS‐CISe SCs with 300 and 800 nm‐thick absorber via a streamlined single‐stage co‐evaporation process exhibit a power conversion efficiency (PCE) of 6.32% and 10.6%, respectively. When double‐sided total 2.0 sun illumination is assumed in an albedo environment, the bifacial power generation densities (BPGD) of them increases to 9.41% and 13.9%. Four‐terminal bifacial semitransparent tandem solar cells (4T‐BST SCs) are fabricated to increase the BPGD by mechanically stacking a BS‐perovskite (PVK) top cell on top of a BS‐CISe bottom cell with the 300 and 800 nm‐thick absorber layers. When summed up, the best top and bottom cell PCEs of the 4T‐BST SC with 300 and 800 nm‐thick BS‐CISe SC are 18.8% and 21.1%, respectively. However, the practical BPGD values of the 4T‐BST SC under total 2 sun illumination are interestingly 23.4% and 24.4%, respectively. This is because the BS‐CISe bottom cell's thickness affects how much rear‐side illumination is transmitted to the BS‐PVK top cell, increasing its current density and BPGD. Bifacial semitransparent CuInSe2 thin film can be diversely applicable not only to provide transparency in semitransparent solar cells, but also to achieve high power generation in tandem devices. When the semitransparent CuInSe2 bottom cell is combined with perovskite top cell in bifacial semitransparent tandem device, it increases bifacial power generation density by aggressively utilizing the rear‐side illumination.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202305796