Reduced optical loss in mechanically stacked multi-junction organic solar cells exhibiting complementary absorptions

Lin, Yen Tseng; Chou, Chu Hsien; Chen, Fang‐Chung; Chu, Chih Wei; Hsu, Chain‐Shu

doi:10.1364/oe.22.00a481

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…In a 4T tandem device, the component cells are electrically independent while being optically coupled. In practice, the two cells would be stacked mechanically on top of each other and the optical coupling would typically consist of just a gap of air or transparent glue as an optical coupler. , The gap by itself would serve as an intermediate reflector, reflecting part of the light back into the perovskite top cell. The light then has to couple from either air or the optical coupling medium into the bottom cell.…”

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confidence: 99%

Performance Evaluation of Semitransparent Perovskite Solar Cells for Application in Four-Terminal Tandem Cells

et al. 2018

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The efficiency of perovskite-based tandem solar cells and the respective efficiency gain over the single-junction operation of the bottom cell strongly depend on the performance of the component cells. Thus, a fair comparison of reported top cells is difficult. We therefore compute the tandem cell efficiency for the combination of several semitransparent perovskite top solar cells and crystalline silicon or chalcopyrite bottom cells from the literature. We focus on four-terminal configurations but also estimate and discuss the differences between four-and two-terminal configurations. For each top cell, we thereby determine the tandem cell performance as a function of the bottom cell efficiency, which results in a linear relationship. From these data, we extract two parameters to quantify the suitability of the top cell: (i) the slope of the tandem vs. bottom cell efficiency, which is the effective transparency of the top cell, and (ii) the tandem cell efficiency for a targeted bottom cell. These two figures of merit were calculated for a representative set of bottom cells and may serve for comparison of semitransparent perovskite top cells in the future.

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confidence: 99%

Performance Evaluation of Semitransparent Perovskite Solar Cells for Application in Four-Terminal Tandem Cells

et al. 2018

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“…Thin Ag electrodes (15−20 nm) have higher sheet resistances than thick ones (60−70 nm), which leads to increased R s in the ST-OSCs compared to the opaque ones. 27 The R s of 1:3:1 and 1:4:1 ST-OSCs reach high values of 9.40 and 8.53 Ω•cm 2 , respectively, thus producing a larger drop in FF and V oc 3a). As a result, the highest PCE obtained for ST-OSCs (4.25%) corresponds to the binary active layers.…”

Section: ■ Results and Discussionmentioning

confidence: 89%

“…Their J sc have values approximately 30% lower than the corresponding opaque OSCs (Tables and ). Thin Ag electrodes (15–20 nm) have higher sheet resistances than thick ones (60–70 nm), which leads to increased R s in the ST-OSCs compared to the opaque ones . The R s of 1:3:1 and 1:4:1 ST-OSCs reach high values of 9.40 and 8.53 Ω·cm 2 , respectively, thus producing a larger drop in FF and V oc compared to binary OSCs, which maintain relatively low R s values of 6.05 Ω·cm 2 (Figure a).…”

Section: Results and Discussionmentioning

confidence: 99%

Ternary Active Layers for Neutral Color Semitransparent Organic Solar Cells with PCEs over 4%

Sano

Inaba

Vohra

2019

ACS Appl. Energy Mater.

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Ternary blend active layers that include an additional electron donor or electron acceptor material provide the means to easily tune the transmission properties of semitransparent organic solar cells (OSCs) by simply changing the relative concentration of each active material. We added a nonfullerene acceptor (ITIC) into a well-studied donor:acceptor active layer (PCDTBT:PC71BM) that can be produced in air and demonstrates long-term operational stability. We investigated the optoelectronic properties of the resulting OSCs and observed that partially replacing the fullerene electron acceptor, PC71BM, with ITIC produces uniformly absorbing active layers, which, however, generate a slight decrease in photovoltaic performances compared to the reference binary OSCs. On the other hand, adding ITIC to an optimized PCDTBT:PC71BM ratio of 1:4 leads to a slight increase in short-circuit current density from these ternary OSCs with respect to the binary ones. In semitransparent OSCs fabricated with a PCDTBT:PC71BM:ITIC ratio of 1:4:1, power conversion efficiencies of 4%, average visible transparencies around 40% and color rendering indices of 97 are produced. As the addition of ITIC does not affect the long-term operational stability of the unencapsulated PCDTBT:PC71BM OSCs, our study opens the path to the fabrication of stable semitransparent OSCs with balanced optoelectronic properties that could readily be applied as solar energy-harvesting photovoltaic windows.

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“…However, the maximum thickness is limited to approximately 100 nm, which means that it cannot absorb all of the incident photons, due to the low mobility of organic materials and the high degree of charge recombination. Also the absorption range of single organic materials is usually narrow [15,16]. An effective approach to resolve this issue is the use of nanoparticles in PSCs appropriately.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of polymer solar cells using copper oxide nanoparticles

Wanninayake

Gunashekar

et al. 2015

Semicond. Sci. Technol.

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Copper oxide (CuO) is a p-type semiconductor with a band gap energy of 1.5 eV, this is close to the ideal energy gap of 1.4 eV required for solar cells to allow good solar spectral absorption. The inherent electrical characteristics of CuO nanoparticles make them attractive candidates for improving the performance of polymer solar cells when incorporated into the active polymer layer. The UV-visible absorption spectra and external quantum efficiency of P3HT/PC70BM solar cells containing different weight percentages of CuO nanoparticles showed a clear enhancement in the photo absorption of the active layer, this increased the power conversion efficiency of the solar cells by 24% in comparison to the reference cell. The short circuit current of the reference cell was found to be 5.234 mA cm −2 and it seemed to increase to 6.484 mA cm −2 in cells containing 0.6 mg of CuO NPs; in addition, the fill factor increased from 61.15% to 68.0%, showing an enhancement of 11.2%. These observations suggest that the optimum concentration of CuO nanoparticles was 0.6 mg in the active layer. These significant findings can be applied to design high-efficiency polymer solar cells containing inorganic nanoparticles.

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Reduced optical loss in mechanically stacked multi-junction organic solar cells exhibiting complementary absorptions

Cited by 5 publications

References 34 publications

Performance Evaluation of Semitransparent Perovskite Solar Cells for Application in Four-Terminal Tandem Cells

Performance Evaluation of Semitransparent Perovskite Solar Cells for Application in Four-Terminal Tandem Cells

Ternary Active Layers for Neutral Color Semitransparent Organic Solar Cells with PCEs over 4%

Performance enhancement of polymer solar cells using copper oxide nanoparticles

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