Semitransparent Organic Solar Cells with Vivid Colors

Li, Xue; Xia, Ruoxi; Yan, Kangrong; Ren, Jie; Yip, Hin‐Lap; Li, Chang‐Zhi; Chen, Hongzheng

doi:10.1021/acsenergylett.0c01554

Cited by 112 publications

(102 citation statements)

References 48 publications

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“…employed a device structure with a high‐quality Fabry–Pérot (F–P) resonant microcavity embedded in electrodes. [ 34 ] Enabled by the optimized optical simulation, the resulted ST‐OSCs based on the structure of glass/ITO/PEDOT:PSS/PM6:Y6/Bis‐FIMG/Ag/TeO2/Ag displayed excellent color‐tunability and produced a remarkable PCEs/ T Max of 14.04/31.0%, 14.60/21.8%, and 14.28/25.2%, respectively for blue, green and red devices. Overall, this study offers a new dimension to access ST‐OSCs with vivid color using the single active layer materials.…”

Section: Multifunctional St‐oscsmentioning

confidence: 99%

“…ST‐OSCs have a wide variety of applications, such as in BIPVs, car shelters, greenhouses, [ 24–27 ] automobile sunroof, [ 28 ] and wearable electronics, [ 29 ] thus turning normal OSCs into multifunctional power‐harvesting units ( Figure a‐i). Furthermore, empowered by bandgap and optical engineering technologies, these ST‐OSCs can also be used to produce colorful devices for aesthetically pleasing architectural applications, [ 27,30–34 ] heat insulation [ 35–38 ] and indoor functionality [ 39 ] via systematic tailoring of the active layer to absorb specific spectral ranges (ultraviolet (UV), visible, or near‐infrared (NIR)) and light management methods.…”

Section: Introductionmentioning

confidence: 99%

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Latest Progress on Photoabsorbent Materials for Multifunctional Semitransparent Organic Solar Cells

Kini

Jeon

Moon

2021

Adv Funct Materials

132

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Semi‐transparent organic solar cells (ST‐OSCs) have revolutionized the field of photovoltaics (PVs) due to their unique abilities, such as transparency and color tunability, and have transformed normal power‐harvesting OSC devices into multifunctional devices, such as building‐integrated photovoltaics, agrivoltaics, floating photovoltaics, and wearable electronics. Very recently, ST‐OSCs have seen remarkable progress, with a rapid increase in power conversion efficiency from below 7% to 12–14%, with an average visible transparency of 9–25%, especially due to the use of low bandgap semiconductors including polymer donors and non‐fullerene acceptors that exhibit absorption in the near‐infrared region as photoabsorbent materials. From this perspective, the latest developments in ST‐OSCs stemming from the innovations in photovoltaic materials that delivered multifunctional ST‐OSCs with top‐of‐the‐line power conversion efficiencies are discussed to shed light on the structure‐property relationship between molecular design and current challenges in this cutting‐edge research field. Finally, personal perspectives, including research directions for the future use of ST‐OSCs in multifunctional applications, are also proposed.

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Section: Multifunctional St‐oscsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Latest Progress on Photoabsorbent Materials for Multifunctional Semitransparent Organic Solar Cells

Kini

Jeon

Moon

2021

Adv Funct Materials

132

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“…To investigate the exciton dissociation and extraction processes, the photocurrent density ( J ph ) as a function of the effective voltage ( V eff ) was plotted (Figure 2d) using the equation J ph = J L − J D , in which J L is the current density under illumination and J D is that in the dark; V eff = V 0 − V A , where V 0 is the voltage when J ph is equal to 0, and V A is the applied bias voltage. [ 30 ] Scanning voltage from −1.5 to 1.5 V, the gross photogenerated excitons are assumed to dissociate into free charge carriers and then collected by the electrodes. The exciton dissociation efficiency ( η diss = J sc / J sat ) and charge collection efficiency ( η coll = J max power / J sat ) were calculated under the short‐circuit and maximum power output conditions, [ 31 ] and the corresponding data are listed in Table S9, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

15.3% Efficiency All‐Small‐Molecule Organic Solar Cells Achieved by a Locally Asymmetric F, Cl Disubstitution Strategy

Yang

Zheng

et al. 2021

Advanced Science

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Single junction binary all-small-molecule (ASM) organic solar cells (OSCs) with power conversion efficiency (PCE) beyond 14% are achieved by using non-fullerene acceptor Y6 as the electron acceptor, but still lag behind that of polymer OSCs. Herein, an asymmetric Y6-like acceptor, BTP-FCl-FCl, is designed and synthesized to match the recently reported high performance small molecule donor BTR-Cl, and a record efficiency of 15.3% for single-junction binary ASM OSCs is achieved. BTP-FCl-FCl features a F,Cl disubstitution on the same end group affording locally asymmetric structures, and so has a lower total dipole moment, larger average electronic static potential, and lower distribution disorder than those of the globally asymmetric isomer BTP-2F-2Cl, resulting in improved charge generation and extraction. In addition, BTP-FCl-FCl based active layer presents more favorable domain size and finer phase separation contributing to the faster charge extraction, longer charge carrier lifetime, and much lower recombination rate. Therefore, compared with BTP-2F-2Cl, BTP-FCl-FCl based devices provide better performance with FF enhanced from 71.41% to 75.36% and J sc increased from 22.35 to 24.58 mA cm −2 , leading to a higher PCE of 15.3%. The locally asymmetric F, Cl disubstitution on the same end group is a new strategy to achieve high performance ASM OSCs.

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“…The TeO 2 is selected as an anti-reflection capping layer by considering its high refractive index. [44,59] With the guidance of optical simulation, TeO 2 thickness-dependent optical behavior is simulated. As shown in Figure 5b, increasing the TeO 2 from 0 to 50 nm would gradually decrease the J sc to a valley of 18.15 mA cm −2 .…”

Section: Optical Manipulationmentioning

confidence: 99%

“…[36] Moreover, the optical interference effect within the multiple-layered device provides a good platform to manipulate the wavelength-dependent light intensity distribution within the device and optical transmittance out of device, and this can be a powerful tool to enhance the absorbing selectivity of ST-OPV. [37][38][39][40][41][42][43][44] For example, depositing LiF/MoO 3 photonic reflector improves the absorbing selectivity and device performance of ST-OPV by selectively transmit photons in 550 nm. [45] Similar effect has been achieved by Durrant et.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Semi‐Transparent Organic Photovoltaic Devices via Improving Absorbing Selectivity

Zuo

et al. 2021

Advanced Energy Materials

Self Cite

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facades, roofs, etc. [1-4] Criteria to evaluate the performance of (semi-)transparent photovoltaic (ST-PV) include power conversion efficiency (PCE), averaged photopic transmittance (APT), and color rendering index (CRI), which indicates how good the original color is retained. [5] Since the light-absorbing and transmittance seem a paradox for PV devices, the light utilization efficiency (LUE), a product of PCE and APT (LUE = PCE × APT), is proposed to judge the performance of ST-PV. [4,5] Considering that the solar energy comprises photons of different energies or wavelengths (including both the visible and invisible photons), an ideal ST-PV device should make full use of the invisible photons to achieve high PCE, while allowing most of the visible photons to penetrate through for sake of high APT and CRI. [6-8] Thereafter, photovoltaic devices with good absorbing selectivity, that is, the ability to selectively absorb the near-infrared (NIR) photons and transmit the visible ones, are highly favored for high-performance ST-PV. Theoretically, the maximum LUE of single-junction ST-PV can reach over 20% with absolute selective absorbing property (Figure 1a). [9] While, the practical record LUE can only reach 5.7%, even with the tandem structure. [10] The huge gap can be attributed to the poor absorbing selectivity of ST-PV. [11-13] Particularly, energy band principle excludes most of the high-efficiency photovoltaic materials for ST-PV application. For example, although the inorganic photovoltaic materials, such as silicon, CIGS, CdTe, GaAs, etc, exhibit excellent performance approaching the S-Q limit and NIR absorbing properties, the energy band principle determines their strong absorption in the visible region (≈0% APT) and thus poor selective absorption. [14-16] As a result, these materials are seldom considered for ST-PV application. Fortunately, the semi-transparent organic photovoltaic (ST-OPV) device seems one exception to break the curse of energy band principle to fulfill good selective absorption. The organic semiconductors typically exhibit vibronic lightabsorbing features, which show peaks and valleys in different absorbing regions. Moreover, their absorption profiles can be easily tailored via modifying the molecular structures, rendering more space to realize good absorption selectivity. [17-20] Indeed, tremendous efforts have been devoted to explore high-performance ST-OPV. Particularly, developing the high-performance low band Semi-transparent organic photovoltaics (ST-OPVs) are promising solar windows for building integration. Improving the light-absorbing selectivity, that is, transmitting the visible photons while absorbing the invisible ones, is a key step toward high-performance ST-OPV. To achieve this goal, the optical properties of the active layer, transparent electrode, and capping layer are comprehensively tailored, and a highly efficient ST-OPV with good absorbing selectivity is demonstrated. First, a numerical method is established to quantify the absorbing selectivity of materials and d...

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Semitransparent Organic Solar Cells with Vivid Colors

Cited by 112 publications

References 48 publications

Latest Progress on Photoabsorbent Materials for Multifunctional Semitransparent Organic Solar Cells

Latest Progress on Photoabsorbent Materials for Multifunctional Semitransparent Organic Solar Cells

15.3% Efficiency All‐Small‐Molecule Organic Solar Cells Achieved by a Locally Asymmetric F, Cl Disubstitution Strategy

High‐Performance Semi‐Transparent Organic Photovoltaic Devices via Improving Absorbing Selectivity

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