Solution‐Processed Organic Solar Cells with High Open‐Circuit Voltage of 1.3 V and Low Non‐Radiative Voltage Loss of 0.16 V

An, Ning; Cai, Yunhao; Wu, Hongbo; Tang, Ailing; Zhang, Kangning; Xin, Hao; Ma, Zaifei; Guo, Qiang; Ryu, Hwa Sook; Woo, Han Young; Sun, Yanming; Zhou, Erjun

doi:10.1002/adma.202002122

Cited by 191 publications

(143 citation statements)

References 45 publications

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“…[19] Voltage loss was analyzed according to a previous report that investigated the origin of the high V OC of the PBQx-TCl:BTA3based device and the improved V OC of the ternary device as compared with the PBQx-TCl:BTP-eC9-based device. [20] The optical bandgap of the device was determined to be 1.81, 1.40, and 1.41 eV from the crossing point of EL and EQE spectra for PBQx-TCl:BTA3, PBQx-TCl:BTP-eC9, and PBQx-TCl:BTA3:BTP-eC9, respectively (Figure S9, Supporting Information). By fitting the reduced spectra of both EL and highly sensitive EQE, we estimated the energy of charge transfer (CT) states to be 1.77, 1.36, and 1.37 eV, indicating a negligible voltage loss of 0.04 V as caused by the exciton dissociation in all three devices (Figure S10, Supporting Information).…”

Section: Devicesmentioning

confidence: 99%

A New Conjugated Polymer that Enables the Integration of Photovoltaic and Light‐Emitting Functions in One Device

et al. 2021

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Exploring the intriguing bifunctional nature of organic semiconductors and investigating the feasibility of fabricating bifunctional devices are of great significance in realizing various applications with one device. Here, the design of a new wide‐bandgap polymer named PBQx‐TCl (optical bandgap of 2.05 eV) is reported, and its applications in photovoltaic and light‐emitting devices are studied. By fabricating devices with nonfullerene acceptors BTA3 and BTP‐eC9, it is shown that the devices exhibit a high power conversion efficiency (PCE) of 18.0% under air mass 1.5G illumination conditions and an outstanding PCE of 28.5% for a 1 cm2 device and 26.0% for a 10 cm2 device under illumination from a 1000 lux light‐emitting diode. In addition, the PBQx‐TCl:BTA3‐based device also demonstrates a moderate organic light‐emitting diode performance with an electroluminescence external quantum efficiency approaching 0.2% and a broad emission range of 630–1000 nm. These results suggest that the polymer PBQx‐TCl‐based devices exhibit outstanding photovoltaic performance and potential light‐emitting functions.

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Section: Devicesmentioning

confidence: 99%

A New Conjugated Polymer that Enables the Integration of Photovoltaic and Light‐Emitting Functions in One Device

et al. 2021

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“…Consequently, the majority of photogenerated states will decay via the NFA singlet exciton, instead of progressing into free charge carriers via the CT state manifold. This analysis provides an important empirical insight into why the charge generation is severely compromised in a number of ultralow offset NFA OSCs, [29,127] including the previously discussed PTB7-Th:IOTIC-0F system; in PTB7-Th:IOTIC-0F, the HOMO offset was found to be just 40 meV. In contrast, charge generation was found to be efficient in the PTB7-Th:IOTIC-2F a and PTB7-Th:IOTIC-4F blends, where the HOMO offset was determined to be 140 and 240 meV, respectively.…”

Section: Charge Generationmentioning

confidence: 99%

The Path to 20% Power Conversion Efficiencies in Nonfullerene Acceptor Organic Solar Cells

Karki

Gillett

Friend

et al. 2020

Advanced Energy Materials

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“…As far as we know, ΔE 3 approaching 0.2 eV represents one of the lowest values of nonradiative E loss in OSCs to date. [63] NFAs that can enable devices to achieve high V oc is desirable because they can be combined with other materials with large J sc in ternary blend to further improve the efficiency of OSCs. The common practice in increasing the V oc of Y6-type NFAs is to replace the F atom of terminal groups with electron-donating units.…”

Section: Doi: 101002/aenm202003177mentioning

confidence: 99%

Asymmetric Acceptors Enabling Organic Solar Cells to Achieve an over 17% Efficiency: Conformation Effects on Regulating Molecular Properties and Suppressing Nonradiative Energy Loss

Gao

et al. 2020

Advanced Energy Materials

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136

120

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Y6, as a state‐of‐the‐art nonfullerene acceptor (NFA), is extensively optimized by modifying its side chains and terminal groups. However, the conformation effects on molecular properties and photovoltaic performance of Y6 and its derivatives have not yet been systematically studied. Herein, three Y6 analogs, namely, BP4T‐4F, BP5T‐4F, and ABP4T‐4F, are designed and synthesized. Owing to the asymmetric molecular design strategies, three representative molecular conformations for Y6‐type NFAs are obtained through regulating the lateral thiophene orientation of the fused core. It is found that conformation adjustment imposes comprehensive effects on the molecular properties in neat and blend films of these NFAs. As a result, organic solar cells (OSCs) fabricated with PM6:BP4T‐4F, PM6:BP5T‐4F, and PM6:ABP4T‐4F show high power conversion efficiency of 17.1%, 16.7%, and 15.2%, respectively. Interestingly, these NFAs with different conformations also show reduced energy loss (Eloss) in devices via gradually suppressed nonradiative Eloss. Moreover, by employing a selenium‐containing analog, CH1007, as the complementary third component, ternary OSCs based on PM6:BP5T‐4F:CH1007 (1:1.02:0.18) achieve a 17.2% efficiency. This work helps shed light on engineering the molecular conformation of NFAs to achieve high efficiency OSCs with reduced voltage loss.

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Solution‐Processed Organic Solar Cells with High Open‐Circuit Voltage of 1.3 V and Low Non‐Radiative Voltage Loss of 0.16 V

Abstract: During the past decade, solution-processed bulk-heterojunction (BHJ) organic solar cells (OSCs) have made great strides and power conversion efficiencies (PCEs) over 16% have been achieved. [1-6] However, the PCEs of top-performing

Cited by 191 publications

References 45 publications

A New Conjugated Polymer that Enables the Integration of Photovoltaic and Light‐Emitting Functions in One Device

A New Conjugated Polymer that Enables the Integration of Photovoltaic and Light‐Emitting Functions in One Device

The Path to 20% Power Conversion Efficiencies in Nonfullerene Acceptor Organic Solar Cells

Asymmetric Acceptors Enabling Organic Solar Cells to Achieve an over 17% Efficiency: Conformation Effects on Regulating Molecular Properties and Suppressing Nonradiative Energy Loss

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