TY - GEN
T1 - CIGS tandem on Silicon
T2 - 53rd IEEE Photovoltaic Specialists Conference, PVSC 2025
AU - Bidaud, T.
AU - Pineau, F.
AU - Salmon, E.
AU - Buencuerpo, J.
AU - Pusapat, R.
AU - Vermang, B.
AU - De Wild, J.
AU - Spreer, P.
AU - Sperlich, H. P.
AU - Barreau, N.
AU - Naghavi, N.
AU - Guillemoles, J. F.
AU - Collin, S.
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025/1/1
Y1 - 2025/1/1
N2 - A promising CIGS/Si 2-terminal tandem structure is explored in this contribution where the two subcells are bonded through the use of an optimized transparent conductive layer. This architecture avoids inherent issues related to direct growth of CIGS on top of a bifacial silicon heterojunction (SHJ) cell but requires optimization of the conductive and transparent bonding layers to enable gluing rough or textured surfaces. An in-house bonding process, based on PEDOT:PSS polymer, has been successfully optimized to glue a rough CIGS top cell with a textured SHJ cell. The first proof-of-concept bonded tandem device (∼1 cm2) exhibits a remarkable Voc=1.28V. Electrical characterizations, including IV, EQE, and electroluminescence are performed to identify the key factors limiting efficiency. These experimental insights are further analyzed using an optical model, which predicts the current-limiting cell, evaluates current matching, and provides a detailed analysis of optical losses, providing clear directions for future optimizations.
AB - A promising CIGS/Si 2-terminal tandem structure is explored in this contribution where the two subcells are bonded through the use of an optimized transparent conductive layer. This architecture avoids inherent issues related to direct growth of CIGS on top of a bifacial silicon heterojunction (SHJ) cell but requires optimization of the conductive and transparent bonding layers to enable gluing rough or textured surfaces. An in-house bonding process, based on PEDOT:PSS polymer, has been successfully optimized to glue a rough CIGS top cell with a textured SHJ cell. The first proof-of-concept bonded tandem device (∼1 cm2) exhibits a remarkable Voc=1.28V. Electrical characterizations, including IV, EQE, and electroluminescence are performed to identify the key factors limiting efficiency. These experimental insights are further analyzed using an optical model, which predicts the current-limiting cell, evaluates current matching, and provides a detailed analysis of optical losses, providing clear directions for future optimizations.
UR - https://www.scopus.com/pages/publications/105016245012
U2 - 10.1109/PVSC59419.2025.11132103
DO - 10.1109/PVSC59419.2025.11132103
M3 - Conference contribution
AN - SCOPUS:105016245012
T3 - Conference Record of the IEEE Photovoltaic Specialists Conference
SP - 645
EP - 647
BT - 2025 IEEE 53rd Photovoltaic Specialists Conference, PVSC 2025
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 8 June 2025 through 13 June 2025
ER -