Application of Bifacial Semitransparent CuInSe 2 Absorber to the Bottom Cell in Bifacial Semitransparent Perovskite/CuInSe 2 Tandem Solar Cell for Albedo Environment

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 20; no. 9; p. e2305796
• 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: Journal Article
• Language: English
• Published: Germany 01.03.2024
• Subjects: bifacial semitransparent solar cells; albedo effect; bifacial semitransparent tandem solar cells; CuInSe2; perovskite
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202305796

Although various types of bifacial solar cells exist, few studies have been conducted on bifacial semitransparent CuInSe 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.