Near‐Infrared Ternary Tandem Solar Cells

Li, Yongxi; Lin, Jiu‐Dong; Liu, Xiao; Qu, Yue; Wu, Fu‐Peng; Liu, Feng; Jiang, Zuo‐Quan; Forrest, Stephen R.

doi:10.1002/adma.201804416

Cited by 68 publications

(46 citation statements)

References 35 publications

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“…Recently, Forrest and co‐workers fabricated tandem OSC with a blend of PTB7‐Th: BT‐CIC as rear sub‐cell, vacuum processed DTDCPB:PC 71 BM as front sub‐cell, and using antireflection coating, an excellent PCE of 15.0% was recorded . Moreover, using a ternary blend of PTB7‐Th: BT‐CIC : TT‐FIC with PCE of 12.6% as rear sub‐cell and the PCE was improved up to 15.4% . Also, a record PCE of 17.36% with J SC of 14.35 mA cm −2 , V OC of 1.642 V, and FF of 0.737 was achieved by using semi‐empirical guidance and fabricating wide bandgap PBDB‐Th: F‐M blend as front sub‐cell, and NIR absorbing PTB7‐Th: CO i 8DFIC :PC 71 BM ternary blend as rear sub‐cell in an inverted tandem OSC configuration .…”

Section: Other Aspects Of Frea Oscsmentioning

confidence: 99%

“…Due to the synergistic effect of structurally similar ITCPTC and MeIC inducing optimal pure domain and domain size improved the morphology and thereby FF. Forrest and co‐workers utilized two NIR absorbing FREAs ( BT‐CIC and TT‐FIC ) with polymer PTB7‐Th in a ternary BHJ . Owing to extended absorption of the ternary blend up to 1000 nm led a higher PCE of 12.6% than that of binary PTB7‐Th: BT‐CIC blend (10.8%).…”

Section: Other Aspects Of Frea Oscsmentioning

confidence: 99%

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Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

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The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement from ≈2.5% in 2013 to 17.3% in 2018 in OSC performance is primarily credited to novel nonfullerene acceptors (NFA), especially fused ring electron acceptors (FREAs). FREAs offer unique advantages over FAs, like broad absorption of solar radiation, and they can be extensively chemically manipulated to tune optoelectronic and morphological properties. Herein, the current status in FREA‐based OSCs is summarized, such as design strategies for both wide and narrow bandgap FREAs for BHJ, all‐small‐molecule OSCs, semi‐transparent OSC, ternary, and tandem solar cells. The photovoltaics parameters for FREAs are summarized and discussed. The focus is on the various FREA structures and their role in optical and morphological tuning. Besides, the advantages and drawbacks of both FAs and NFAs are discussed. Finally, an outlook in the field of FREA‐OSCs for future material design and challenges ahead is provided.

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Section: Other Aspects Of Frea Oscsmentioning

confidence: 99%

Section: Other Aspects Of Frea Oscsmentioning

confidence: 99%

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

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“…Even worse, these ST‐OSCs generally display various colors, making it more difficult to realize high‐performance ST‐OSCs with promising AVT and neutral color simultaneously. To address the above issues, many efforts have been devoted to the following aspects: (1) developing high‐conductivity and high‐transparency electrodes to reduce the visible‐light reflectance/absorption and contact resistance; (2) synthesizing a nonfullerene acceptor‐based photoactive layer with low energy losses and strong near‐infrared (NIR) absorption but weak visible absorption to simultaneously increase AVT and power conversion efficiency (PCE); and (3) incorporating optical engineering to enhance absorption and tuning color conception . Based on the above strategies, as shown in Figure a, ST‐OSCs with promising PCEs of 8%–10% and AVT of over 20% were successfully constructed .…”

Section: Photovoltaic Performance Parameters Of the Oscs With Differementioning

confidence: 99%

Highly Efficient Semitransparent Organic Solar Cells with Color Rendering Index Approaching 100

et al. 2019

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of semitransparent organic solar cells (ST-OSCs) with transparent facilities, such as building windows, automobile glass, and greenhouse rooftops, is of particular interest, since it opens up the prospect of employing the facade for solar-power generation rather than simply employing shadowing and visual functions. [7][8][9][10][11][12] Toward this purpose, ST-OSCs need to generate significant power while still maintaining good transparency and neutral-color perception, which can display a vivid picture when looking through ST-OSCs. [13,14] However, the current performance of ST-OSCs is much lower than their opaque counterparts due to their inherent trade-off between photocurrent and average visible transmittance (AVT) in the range of 380-780 nm. Even worse, these ST-OSCs generally display various colors, making it more difficult to realize high-performance ST-OSCs with promising AVT and neutral color simultaneously. To address the above issues, many efforts have been devoted to the following aspects: (1) developing high-conductivity and high-transparency electrodes to reduce the visible-light reflectance/absorption and contact resistance [15,16] ; (2) synthesizing a nonfullerene acceptor-based photoactive layer with low energy losses and strong near-infrared (NIR) absorption but weak visible absorption to simultaneously increase AVT and power conversion efficiency (PCE) [17][18][19][20][21] ; and (3) incorporating optical engineering to enhance absorption and tuning color conception. [22][23][24][25][26] Based on the above strategies, as shown in Figure 1a, ST-OSCs with promising PCEs of 8%-10% and AVT of over 20% were successfully constructed. [19,[27][28][29] However, the transmitted light still showed strong color bias because of the inhomogeneous device transmittance spectra.To achieve high color-fidelity ST-OSCs for building-integrated photovoltaics application, the light passing through ST-OSCs should maintain the initial component and relative intensity. In other words, the transmittance spectra with flattened, high-transparency, and horizontal characteristics in the visible region can enable neutral-color ST-OSCs. Generally, the color conception of ST-OSCs can be quantified by a color-rendering index (CRI) ranging from 0 to 100 and the color coordinates (x, y) on the Commission Internationale de L'Eclairage (CIE, in French) 1931 color space, where a high CRI value and color coordinates close to AM1.5G (0.35, 0.34) represent neutral-color ST-OSCs. [22,30] Colsmann and co-workers [31] added a red absorbing dye into a top transparent polymeric electrode to compensate for the missing Neutral-colored semitransparent organic solar cells (ST-OSCs) have attracted considerable attention owing to their unique application in no-visual-obstacle building-integrated photovoltaics. Toward this promising potential application, a synergistic effect is first proposed by employing a dielectric mirror and ternary photoactive layer with near-infrared absorption to tune the color perception as well as ST-OSC performance preci...

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“…In the past decade, great efforts have focused on searching for subcells with efficient light absorptions in a wide range with complementary absorption spectra and minimal absorption overlap . For the fullerene derivatives based devices, it is expected to obtain a well‐balanced J sc through appropriate selection of donor materials with different bandgaps since fullerene derivatives have limited absorptions and their contribution on J sc is much smaller than that of the donor materials.…”

Section: The Photovoltaic Performance Of the Single‐junction Devices mentioning

confidence: 99%

A Tandem Organic Solar Cell with PCE of 14.52% Employing Subcells with the Same Polymer Donor and Two Absorption Complementary Acceptors

Meng

Wan

et al. 2019

Advanced Materials

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heterojunction (BHJ)-based OSCs with fullerene derivatives acceptors have reached over 11%, [9,10] and nonfullerene-acceptorbased OSC devices even have achieved PCEs over 14%. [11][12][13][14] However, the current photovoltaics performance of OSCs is still in demand to be further improved when compared with other photo voltaic technologies. [15][16][17][18] Single junction OSCs normally suffer from the limited sunlight absorptions and the thermalization loss of photon energy. The tandem concept with stacking two or more subcells in series or parallel connection could address the above issues. [19][20][21][22][23][24][25] For the widely studied series-connected tandem cells, the overall open circuit voltage (V oc ) of the tandem cell is the sum of the V oc values of the subcells if no potential losses in the interconnection layer. [24,25] The current density (J sc ) is generally limited by the subcell with the smallest one. [20,25] In order to pursue high PCEs for the series-connected tandem cell, there are several important factors should be considered synergistically. First, the subcells should have complementary absorptions and well balanced, and high J sc . Second, the two subcells should have minimal energy loss to retain high V oc and thus guarantee the whole high V oc for the tandem devices. Third, the interconnection layer should attain efficient charge extraction and much reduced recombination.In the past decade, great efforts have focused on searching for subcells with efficient light absorptions in a wide range with complementary absorption spectra and minimal absorption overlap. [26][27][28][29][30][31][32] For the fullerene derivatives based devices, it is expected to obtain a well-balanced J sc through appropriate selection of donor materials with different bandgaps since fullerene derivatives have limited absorptions and their contribution on J sc is much smaller than that of the donor materials. To date, PCEs ≈13% have been achieved for the fullenerebased tandem OSCs. [33] The reasons exist in two aspects for the likely ceiling efficiencies of fullerene derivatives based tandem OSCs. [28] The first one is the lack of suitable donor materials, especially narrow bandgap donors utilized for rear cells to achieve the high and balanced J sc for tandem cells. The second one is the general large energy loss of the fullerene The tandem structure is an efficient way to simultaneously tackle absorption and thermalization losses of the single junction solar cells. In this work, a high-performance tandem organic solar cell (OSC) using two subcells with the same donor poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′] dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′c:4′,5′-c′]dithiophene-4,8-dione))] (PBDB-T) and two acceptors, F-M and 2,9-bis(2-methylene-(3(1,1-dicyanomethylene)benz[f ]indanone))7,12-dihydro-(4,4,10,10-tetrakis(4-hexylphenyl)-5,11-diocthylthieno[3′,2′:4,5]cyclopenta[1,2-b] thieno[2″,3″:3′,4′]cyclopenta[1′,2′:4,5]thieno[2,3-f ][1]benzothiophene (N...

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Near‐Infrared Ternary Tandem Solar Cells

Cited by 68 publications

References 35 publications

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Highly Efficient Semitransparent Organic Solar Cells with Color Rendering Index Approaching 100

A Tandem Organic Solar Cell with PCE of 14.52% Employing Subcells with the Same Polymer Donor and Two Absorption Complementary Acceptors

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