Efficient and Thermally Stable All‐Perovskite Tandem Solar Cells Using All‐FA Narrow‐Bandgap Perovskite and Metal‐oxide‐based Tunnel Junction

Wu, Pu; Wen, Jin; Wang, Yurui; Liu, Zhou; Lin, Renxing; Li, Hongjiang; Luo, Haowen; Hui‐min, Tan

doi:10.1002/aenm.202202948

Cited by 34 publications

(26 citation statements)

References 44 publications

(59 reference statements)

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“…The RbI PSCs generated a higher V OC of 0.823 V (0.817 V), a FF of 77.8% (75.0%), and a 20.12% (19.24%) PCE in reverse (forward) compared with those of the reference device with 0.762 V (0.757 V) V OC , 76.8% (72.7%) FF, and 18.32% (17.01%) PCE in reverse (forward). To our knowledge, this result marks -next to the nitrogen gas quenching with 20% PCE [27] -the first report of MA-free Sn-Pb PSCs with PCE greater than 20% [8,[24][25][26][27][28]44] enabled by the RbI additive. The RbI additive additionally reduced hysteresis during J-V measurements.…”

Section: Investigations In Solar Cell Devicesmentioning

confidence: 60%

“…In addition, the MA-free Sn-Pb was applied in APTSCs, and gained an impressive efficiency of 26.3% when indium tin oxide nanocrystals were employed as hole transport material (HTL) to replace poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). [28] Despite these promising developments, MA-free Sn-Pb perovskites still lag behind MA-containing Sn-Pb perovskites in terms of performance and research intensity.…”

Section: Introductionmentioning

confidence: 99%

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Rubidium Iodide Reduces Recombination Losses in Methylammonium‐Free Tin‐Lead Perovskite Solar Cells

Yang

MacQueen

Menzel

et al. 2023

Advanced Energy Materials

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The tunable bandgap energy (E g ) of metal halide perovskites has led to one of the most interesting developments in this context, namely the all-perovskite tandem solar cells (APTSCs), which is formed by combining two perovskite-based sub-cells with different bandgaps into a monolithically stacked structure. This tandem structure allows the solar cell to absorb different components of sunlight within the two absorber layers, extracting on average more useable energy per photon absorbed. Consequently, tandem solar cells can achieve a power conversion efficiency (PCE) above that of a single-junction solar cell, the limiting efficiency of which is marked by the single-junction radiative limit. [2] To most effectively implement this concept, the monolithic APTSCs usually consist of a narrow (≈1.20 eV) and a wide (≈1.80 eV) E g perovskite for the bottom and top subcells, [3] respectively. APTSCs have been reported with PCEs of 28.0%, i.e., well beyond 25.7% PCE of the current record single-junction perovskite solar cell (PSC). [4,5] This study concerns the bottom cell of APTSCs, which uses a narrow bandgap perovskite film as the light absorber. Mixing tin (Sn) and lead (Pb) as the B-site cation is required to achieve a sufficiently small E g . [6] Sn-Pb perovskites reach a minimum E g of ≈1.20 eV when the ratio of Sn to Pb is about Outstanding optoelectronic properties of mixed tin-lead perovskites are the cornerstone for the development of high-efficiency all-perovskite tandems. However, recombination losses in Sn-Pb perovskites still limit the performance of these perovskites, necessitating more fundamental research. Here, rubidium iodide is employed as an additive for methylammonium-free Sn-Pb perovskites. It is first investigated the effect of the RbI additive on the perovskite composition, crystal structure, and element distribution. Quasi-Fermi level splitting and transient photoluminescence measurements reveal that the RbI additive reduces recombination losses and increases carrier lifetime of the perovskite films. This finding is attributed to an approximately ten-fold reduction in the defect density following RbI treatment, as probed using constant final state yield photoelectron spectroscopy. Additionally, the concentration of Sn vacancies is also reduced, and the perovskite film becomes less p-type both in the bulk and at the interface towards the electron contact. Thus, the conductivity for electrons increases, improving carrier extraction. As a result, the open-circuit voltage of RbI-containing solar cells improves by 61 mV on average, with the best efficiency >20%. This comprehensive study demonstrates that RbI is effective at reducing recombination losses and carrier trapping, paving way for a new approach to Sn-Pb perovskite solar cell research.

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Section: Investigations In Solar Cell Devicesmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Rubidium Iodide Reduces Recombination Losses in Methylammonium‐Free Tin‐Lead Perovskite Solar Cells

Yang

MacQueen

Menzel

et al. 2023

Advanced Energy Materials

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“…The decreased PV performance is mainly ascribed to the volatile nature of methylammonium (MA) 31 , 33 and an unfavorable thermal-induced reaction at the PEDOT: PSS/perovskite interface 34 , 35 . Efforts have been devoted to developing MA-free NBG perovskites and thermally stable HTL materials to improve the thermal stability of NBG PSCs 25 , 36 – 38 . We found that relatively low post annealing temperature, i.e.…”

Section: Resultsmentioning

confidence: 99%

Oxidation-resistant all-perovskite tandem solar cells in substrate configuration

et al. 2023

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The commonly-used superstrate configuration (depositing front subcell first and then depositing back subcell) in all-perovskite tandem solar cells is disadvantageous for long-term stability due to oxidizable narrow-bandgap perovskite assembled last and easily exposable to air. Here we reverse the processing order and demonstrate all-perovskite tandems in a substrate configuration (depositing back subcell first and then depositing front subcell) to bury oxidizable narrow-bandgap perovskite deep in the device stack. By using guanidinium tetrafluoroborate additive in wide-bandgap perovskite subcell, we achieve an efficiency of 25.3% for the substrate-configured all-perovskite tandem cells. The unencapsulated devices exhibit no performance degradation after storage in dry air for 1000 hours. The substrate configuration also widens the choice of flexible substrates: we achieve 24.1% and 20.3% efficient flexible all-perovskite tandem solar cells on copper-coated polyethylene naphthalene and copper metal foil, respectively. Substrate configuration offers a promising route to unleash the commercial potential of all-perovskite tandem solar cells.

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“…[5][6][7] Thus, to improve the efficiency and stability, a continuous effort to control the presence of Sn(IV) in Sn-Pb PSC is needed.For typical high-efficiency (>21%) NBG perovskite solar cells (PSCs), a large content (40%-60%) of Sn(II) components were required to achieve the desirable bandgap. [8][9][10] Without proper treatment, the Sn(IV) could be generated at various stages in the experimental process. For example, the omnipresence of Sn(IV) produced during film preparation process acting as charge carrier recombination centers can lead to a significant loss of photovoltage in solar cells.…”

mentioning

confidence: 99%

DMSO‐Free Solvent Strategy for Stable and Efficient Methylammonium‐Free Sn–Pb Alloyed Perovskite Solar Cells

Zhang

Liang

Wang

et al. 2023

Advanced Energy Materials

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Harmful Sn(IV) vacancies and uncontrolled fast crystallization commonly occur in tin–lead alloyed perovskite films. The typical dimethyl sulfoxide (DMSO) processing solvent is suggested to be the primary source of problems. Here, a DMSO‐free solvent strategy is demonstrated to obtain high‐performance Cs0.25FA0.75Pb0.5Sn0.5I3 solar cells. A rational solvent selection process via Hansen solubility parameters and Gutmann's donor number shows that N,N′‐dimethylpropyleneurea (DMPU) has a strong coordinate ability to form complete complexation with organic (formamidinium iodide) and inorganic (CsI, PbI2, and SnI2) components. This treatment suppresses the iodoplumbate (PbIn2‐n) or iodostannate (SnIn2‐n) preformed in precursor solution, thereby promoting pure intermediate complexes and retarding crystallization, realizing enlarged grain size, and improved film crystallinity. Additionally, it is demonstrated that DMPU‐based solvent system can further inhibit the oxidation of Sn(II) and reduced Sn(IV) content by nearly 75% due to its superior thermal and chemical stability. This DMSO‐free strategy generates a record efficiency of 22.41%, with a Voc of 0.88 V and a FF of 82.72% for the MA‐free Sn–Pb alloyed device. The unencapsulated devices display much‐improved humidity stability at 30 ± 5% relative humidity in air for 240 h, impressive thermal stability at 85 °C for 500 h, and promote continuous operation stability at maximum power point for 150 h.

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Efficient and Thermally Stable All‐Perovskite Tandem Solar Cells Using All‐FA Narrow‐Bandgap Perovskite and Metal‐oxide‐based Tunnel Junction

Cited by 34 publications

References 44 publications

Rubidium Iodide Reduces Recombination Losses in Methylammonium‐Free Tin‐Lead Perovskite Solar Cells

Rubidium Iodide Reduces Recombination Losses in Methylammonium‐Free Tin‐Lead Perovskite Solar Cells

Oxidation-resistant all-perovskite tandem solar cells in substrate configuration

DMSO‐Free Solvent Strategy for Stable and Efficient Methylammonium‐Free Sn–Pb Alloyed Perovskite Solar Cells

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