Fully Solution‐Processed Small Molecule Semitransparent Solar Cells: Optimization of Transparent Cathode Architecture and Four Absorbing Layers

Min, Jie; Bronnbauer, Carina; Zhang, Zhiguo; Cui, Chaohua; Luponosov, Yuriy N.; Ata, Ibrahim; Schweizer, Peter; Przybilla, Thomas; Guo, Fei; Ameri, Tayebeh; Forberich, Karen; Spiecker, Erdmann; Bäuerle, Peter; Ponomarenko, Sergei A.; Li, Yongfang; Brabec, Christoph J.

doi:10.1002/adfm.201505411

Cited by 75 publications

(53 citation statements)

References 38 publications

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“…Generally, the colors of semitransparent PSCs can be manipulated by tuning the absorption spectra of active layer materials, especially polymer donor materials with different molecular structures and bandgaps . However, strong coloration and colorful devices are rarely achieved, and semitransparent devices usually exhibit a neutral color because the absorption spectra of the photovoltaic materials are broad in the visible region.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Colorful Semitransparent Polymer Solar Cells with Ultrathin Hybrid‐Metal Electrodes and Fine‐Tuned Dielectric Mirrors

Shen

Cui

et al. 2017

Adv Funct Materials

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161

142

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Polymer solar cells (PSCs) possess the unique features of semitransparency and coloration, which make them potential candidates for applications in aesthetic windows. Here, the authors fabricate inverted semitransparent PSCs with high-quality hybrid Au/Ag transparent top electrodes and finetuned dielectric mirrors (DMs). It is demonstrated that the device color can be tailored and the light harvesting in the PSCs can be enhanced by matching the bandgap of the polymer donors in the active layer with the specifically designed maximum-reflection-center-wavelengths of the DMs. A detailed chromaticity analysis of the semitransparent PSCs from both bottom and top (mirror) views is also carried out. Furthermore, the inverted semitransparent PSCs based on PTB7-Th:PC 71 BM with six pairs of DMs demonstrate a maximum power conversion efficiency (PCE) of 7.0% with an average visible transmittance (AVT) of 12.2%. This efficiency is one of the highest reported for semitransparent PSCs, corresponding to 81.4% of the PCE from opaque counterpart devices. The device design and processing method are also successfully adapted to a flexible substrate, resulting in a device with a competitive PCE of 6.4% with an AVT of 11.5%. To the best of our knowledge, this PCE value is the highest value reported for a flexible semitransparent PSC.

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Section: Introductionmentioning

confidence: 99%

High‐Performance Colorful Semitransparent Polymer Solar Cells with Ultrathin Hybrid‐Metal Electrodes and Fine‐Tuned Dielectric Mirrors

Shen

Cui

et al. 2017

Adv Funct Materials

Self Cite

161

142

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“…J sat can indirectly reflect the maximum exciton generation rate (G max ), 38,39 expressed as J sat = qLG max , where q is the elementary charge and L is the active layer thickness. The G max values of the OSCs are 0.76 × 10 28 , 0.78 × 10 28 0.80 × 10 28 m −3 s −1 for the active layers without treatment and with TA or TA&SVA treatment, respectively. According to the assumption above, the exciton dissociation efficiency can be evaluated according to J ph /J sat in the short circuit condition.…”

Section: Resultsmentioning

confidence: 97%

Subtly adjusted active layer self‐assembly process for efficient organic solar cells

Wang

Sun

Xiao

et al. 2019

Polymer International

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The phase separation degree of active layers plays a vital role in enhancing the power conversion efficiency of organic solar cells. Two post treatments were employed to optimize the phase separation degree of active layers by subtly adjusting the self‐assembly process for SMPV1:PC71BM based active layers (SMPV1, 2,6‐bis[2,5‐bis(3‐octylrhodanine)‐(3,3‐dioctyl‐2,2':5,2''‐terthiophene)]‐4,8‐bis((5‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b']dithiophene; PC71BM, [6,6]‐phenyl‐C71‐butyric acid methyl ester). In this work, a power conversion efficiency of 7.93% was obtained for devices with an as‐cast active layer, which is close to the highest values reported for SMPV1 based devices. The power conversion efficiency was further increased to 8.64% or 8.99% for active layers with thermal annealing or thermal annealing together with solvent vapor annealing, respectively. The enhanced performance is mainly attributed to more efficient photon harvesting and charge transport induced by the post annealing treatment of the active layers. The face‐on molecular orientation of SMPV1 is increased for active layers with post annealing treatment, which is beneficial for charge transport along directions perpendicular to the substrate. This work further confirms the positive effect of post annealing treatment on the performance improvement of organic solar cells. © 2019 Society of Chemical Industry

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“…The photovoltaic properties of PB3T‐C66 and PB3TCN‐C66 were evaluated by blending them with IT‐4F in solar cells with a device structure of indium tin oxide (ITO)/poly(3,4‐ethylenedioxythiophene):poly(styrene‐sulfonate) (PEDOT:PSS)/polymer:IT‐4F/PDINO/Ag in which PDINO is a perylene diimide derivative‐functionalized amino N‐oxide 31. Device optimization was conducted in terms of the polymer:IT‐4F weight ratio, solvent, solvent additive, thermal annealing at different temperatures, and layer thickness.…”

Section: Resultsmentioning

confidence: 99%

3,4‐Dicyanothiophene—a Versatile Building Block for Efficient Nonfullerene Polymer Solar Cells

Zhang

Zhou

et al. 2020

Advanced Energy Materials

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In this contribution, a versatile building block, 3,4‐dicyanothiophene (DCT), which possesses structural simplicity and synthetic accessibility for constructing high‐performance, low‐cost, wide‐bandgap conjugated polymers for use as donors in polymer solar cells (PSCs), is reported. A prototype polymer, PB3TCN‐C66, and its cyano‐free analogue polymer PB3T‐C66, are synthesized to evaluate the potential of using DCT in nonfullerene PSCs. A stronger aggregation property in solution, higher thermal transition temperatures with higher enthalpies, a larger dipole moment, higher relative dielectric constant, and more linear conformation are exhibited by PB3TCN‐C66. Solar cells employing IT‐4F as the electron acceptor offer power conversion efficiencies (PCEs) of 11.2% and 2.3% for PB3TCN‐C66 and PB3T‐C66, respectively. Morphological characterizations reveal that the PB3TCN‐C66:IT‐4F blend exhibits better π–π paracrystallinity, a contracted domain size, and higher phase purity, consistent with its higher molecular interaction parameter, derived from thermodynamic calculations. Moreover, PB3TCN‐C66 offers a higher open‐circuit voltage and reduced energy loss than most state‐of‐the‐art wide‐bandgap polymers, without the need of additional electron‐withdrawing substituents. Two additional polymers derived from DCT also demonstrate promising performance with a higher PCE of 13.4% being achieved. Thus, DCT represents a versatile and promising building block for constructing high‐performance, low‐cost, conjugated polymers for application in PSCs.

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Fully Solution‐Processed Small Molecule Semitransparent Solar Cells: Optimization of Transparent Cathode Architecture and Four Absorbing Layers

Cited by 75 publications

References 38 publications

High‐Performance Colorful Semitransparent Polymer Solar Cells with Ultrathin Hybrid‐Metal Electrodes and Fine‐Tuned Dielectric Mirrors

High‐Performance Colorful Semitransparent Polymer Solar Cells with Ultrathin Hybrid‐Metal Electrodes and Fine‐Tuned Dielectric Mirrors

Subtly adjusted active layer self‐assembly process for efficient organic solar cells

3,4‐Dicyanothiophene—a Versatile Building Block for Efficient Nonfullerene Polymer Solar Cells

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