Monolithic Two-Terminal Perovskite/CIS Tandem Solar Cells with Efficiency Approaching 25%

Abstract

Monolithic two-terminal (2T) perovskite/CuInSe 2 (CIS) tandem solar cells (TSCs) combine the promise of an efficient tandem photovoltaic (PV) technology with the simplicity of an all-thin-film device architecture that is compatible with flexible and lightweight PV. In this work, we present the first-ever 2T perovskite/CIS TSC with a power conversion efficiency (PCE) approaching 25% (23.5% certified, area 0.5 cm 2 ). The relatively planar surface profile and narrow band gap (∼1.03 eV) of our CIS bottom cell allow us to exploit the optoelectronic properties and photostability of a low-Br-containing perovskite top cell as revealed by advanced characterization techniques. Current matching was attained by proper tuning of the thickness and bandgap of the perovskite, along with the optimization of an antireflective coating for improved light in-coupling. Our study sets the baseline for fabricating efficient perovskite/CIS TSCs, paving the way for future developments that might push the efficiencies to over 30%.

Computational Modelling and Optimization of a Methylammonium‐free Perovskite and Ga‐free Chalcogenide Tandem Solar Cell with an Efficiency above 25 %

“…Finally, the efficiency reported by this group was 31.13 % for the 2T Perovskite/CIGS tandem solar cell configuration. In June 2022, an international group of scientists headed by Dr. Preciado and Prof. W. Paetzold achieved a certified efficiency of 24.9 % utilizing perovskite/CIS tandem solar cells [23] . In a 2T tandem arrangement, this perovskite/CIS solar cell efficiency measurement is the highest one that has been published.…”

“…In June 2022, an international group of scientists headed by Dr. Preciado and Prof. W. Paetzold achieved a certified efficiency of 24.9 % utilizing perovskite/CIS tandem solar cells. [23] In a 2T tandem arrangement, this perovskite/CIS solar cell efficiency measurement is the highest one that has been published. By decreasing the quantity of gallium, it is possible to get a small band gap of around one electron volt (eV), which is quite near to the optimal value of 0.96 eV for the bottom solar cell in a tandem arrangement.…”

Device Performance of Emerging Photovoltaic Materials (Version 3)

“…With regard to perovskite/CIGS tandem solar cells the development of new bandgap combinations, using narrow‐bandgap (≈1.01 eV) gallium‐free CIS bottom cells, lead to good performance of 23.5% certified. [ 35 ] In terms of scalability (see bottom‐right plot of Figure 3), only the new cells of Si/perovskite and CIGS/perovskite show promising areas equal/close to 1 cm 2 , whereas all other devices were tested with areas smaller than 0.1 cm 2 .…”

“…The first‐ever monolithic CIS/perovskite tandem solar cell has been reported by Ruiz‐Preciado et al. [ 35 ] with a PCE exceeding 23% (23.5% certified, area: 0.5 cm 2 ). The relatively planar surface profile and narrow bandgap of the CIS bottom subcell allowed them to deposit perovskite top subcells of lower bandgap and with a smaller amount of bromide content, which is desirable to reduce photodegradation.…”

Four‐Terminal Perovskite/Copper Indium Gallium Selenide Tandem Solar Cells: Unveiling the Path to >27% in Power Conversion Efficiency

“…[1] Considering efficiency limitations imposed on singlejunction photovoltaic (PV) device performance by the Shockley-Queisser limit, any further increase in PCE is most easily achieved by tandem device architecture. [2][3][4][5][6][7] Due to the wide and tunable bandgap of the perovskite absorber, these semitransparent PSCs are typically employed as the top subcell [8] (%1.55-1.85 eV bandgap) paired with narrow-bandgap silicon, [3,6] copper indium gallium selenide (CIGS), [2,5] CIS [9] or tin-lead PSCs [10][11][12] as the bottom subcell. Within the current state of the art, these tandem devices utilize either a two-terminal (2T) or a four-terminal (4T) architecture.…”