A Critical Review on Efficient Thick‐Film Organic Solar Cells

Gao, Jinhua; Wang, Jian; Xu, Chuanfu; Hu, Zhenghao; Zhang, Xiaoli; Niu, Lianbin; Zhang, Jian; Zhang, Fujun

doi:10.1002/solr.202000364

Cited by 88 publications

(71 citation statements)

References 152 publications

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“…Based on the corresponding J – V curves, the V OC ∝ β ( KT / q )ln( P light ) and J SC ∝ P light α of the typical OPVs are described in Figure 3b. [ 36–39 ] Here, K is the Boltzmann constant, q is the elementary charge, and T is the absolute temperature. If the β value is close to 1, indicating the negligible trap‐assisted recombination in active layers, [ 40,41 ] the β of 1.183 for the optimal ternary OPVs is close to 1, compared with that of 1.342 for the BTP‐BO‐4F‐based binary OPVs and 1.281 for the Y6‐1O‐based binary OPVs, suggesting that trap‐assisted recombination can be efficiently restrained in the optimal ternary OPVs.…”

Section: Resultsmentioning

confidence: 99%

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Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

et al. 2021

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Efficient organic photovoltaic cells (OPVs) are fabricated using two structurally similar Y6 derivations (BTP‐BO‐4F and Y6‐1O) as acceptor and PM6 as donor. The two binary OPVs exhibit a high fill factor (FF) (>76%), the complementary short‐circuit‐current density (JSC) and open‐circuit voltage (VOC). The high FFs of binary OPVs indicate the good compatibility of corresponding materials to form efficient charge transport channels. A power conversion efficiency (PCE) of 17.59% is obtained from ternary OPVs with 15 wt% Y6‐1O in acceptors, benefiting from the simultaneously improved JSC of 26.13 mA cm−2, a VOC of 0.860 V, and an FF of 78.26%. The values of VOC of ternary OPVs can be gradually increased along with the incorporation of Y6‐1O, suggesting the preferred formation of an alloyed state between BTP‐BO‐4F and Y6‐1O due to their good compatibility. Meanwhile, the cascaded energy levels of BTP‐BO‐4F and Y6‐1O can form efficient electron transport channels in ternary active layers. The main contribution of Y6‐1O can be summarized as enhancing photon harvesting, optimizing phase separation, and adjusting molecular arrangement. The experimental results may provide new insight on developing efficient ternary OPVs by selecting two well‐compatible acceptors.

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Section: Resultsmentioning

confidence: 99%

“…[ 42 ] The ln( Jd 3 / V 2 ) dependence on ( V / d ) 0.5 of hole‐only and electron‐only devices with different Y6‐1O contents is exhibited in Figure a,b. The μ h and μ e values are calculated using the Mott–Gurney equation [ 39,43,44 ]

J = \frac{9}{8} ε_{normalr} ε_{normalo} μ \frac{V^{2}}{d^{3}} \exp [0.89 γ \sqrt{\frac{V}{d}}]

…”

Section: Resultsmentioning

confidence: 99%

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

et al. 2021

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“…Due to the merits of being light‐weight, flexible, colorful, semi‐transparent, and being able to be fabricated by roll‐to‐roll printing, [ 1–10 ] organic photovoltaics (OPVs) based on nonfullerene small molecule acceptors (NFAs) have been the subject of renewable energy research in the past 5 years. More and more NFAs are designed and synthesized, helping to advance the field considerably.…”

Section: Introductionmentioning

confidence: 99%

Modulation of Morphological, Mechanical, and Photovoltaic Properties of Ternary Organic Photovoltaic Blends for Optimum Operation

Peng

Jiang

Qin

et al. 2021

Advanced Energy Materials

103

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Ternary solar cells comprising both fullerene and nonfullerene acceptors have shown a rapid increase in power conversion efficiency, which holds promise in commercial applications. Despite the rapid progress, there is still a lack of fundamental understanding of the relations between microstructure and (photovoltaic/mechanical) properties in these ternary blend systems. In this work, the dependence of molecular packing, phase separation, mechanical properties, and photovoltaic performance on acceptor composition of a recently certificated ternary system is thoroughly investigated by combined scattering and microscopy characterizations. It is demonstrated that incorporating a small amount (20% by weight) PC71BM to the PM6:N3 binary blend can afford the best device efficiency and the highest ductility simultaneously. This maximum performance is due to the optimized molecular order, orientational texture, and phase separation. Additionally, increasing the amount of PC71BM results in higher elastic modulus, as probed by two distinct methods. A more crucial observation is that the elastic modulus of ternary blends can be well captured by an extended Halpin–Tsai model. This finding is expected to enable the prediction of the elastic modulus of various kinds of ternary blends that are widely used in solar cells and other electronics.

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“…In fact, the solar cells are generally of low maintenance and may directly convert the abundant sunlight into electric power without emitting gas and noise. Recently, organic photocells have received extensive attention because of their exceptional advantages, such as their light weight, low cost, mechanical flexibility, high transparency, and roll-to-roll large area processing [ 2 ]. Nevertheless, its current power conversion efficiency (PCE) is still far below that obtained in inorganic solar cells [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Coarse-Grained Quantum Theory of Organic Photovoltaic Devices

Sánchez

Wang

2021

Nanomaterials

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Understanding the exciton dissociation process in organic solar cells is a fundamental issue for the design of high-performance photovoltaic devices. In this article, a parameterized quantum theory based on a coarse-grained tight-binding model plus non-local electron-hole interactions is presented, while the diffusion and recombination of excitons are studied in a square lattice of excitonic states, where a real-space renormalization method on effective chains has been used. The Hamiltonian parameters are determined by fitting the measured quantum efficiency spectra and the theoretical short-circuit currents without adjustable parameters show a good agreement with the experimental ones obtained from several polymer:fullerene and polymer:polymer heterojunctions. Moreover, the present study reveals the degree of polymerization and the true driving force at donor-acceptor interface in each analyzed organic photovoltaic device.

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A Critical Review on Efficient Thick‐Film Organic Solar Cells

Cited by 88 publications

References 152 publications

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

Modulation of Morphological, Mechanical, and Photovoltaic Properties of Ternary Organic Photovoltaic Blends for Optimum Operation

Coarse-Grained Quantum Theory of Organic Photovoltaic Devices

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