Polymer solar cells with enhanced open-circuit voltage and efficiency

Chen, Hsiang‐Yu; Hou, Jianhui; Zhang, Shaoqing; Liang, Yongye; Yang, Guan‐Wen; Yang, Yang; Yu, Luping; Wu, Yue; Li, Gang

doi:10.1038/nphoton.2009.192

Cited by 3,031 publications

(1,784 citation statements)

References 34 publications

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“…[1][2][3][4][5][6][7][8] These improvements have been mainly driven by significant progresses in materials synthesis and device engineering. In spite of the great success in device efficiency, many fundamental issues concerning basic operational mechanisms of these devices remain unknown or controversial, limiting further improvement of the device performance.…”

Section: Introductionmentioning

confidence: 99%

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Gao

Inganäs

2014

Phys. Chem. Chem. Phys.

204

252

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Charge generation in organic solar cells is a fundamental yet heavily debated issue. This article gives a balanced review of different mechanisms proposed to explain efficient charge generation in polymer-fullerene bulk-heterojunction solar cells. We discuss the effect of charge-transfer states, excess energy, external electric field, temperature, disorder of the materials, and delocalisation of the charge carriers on charge generation. Although a general consensus has not been reached yet, recent findings, based on both steady-state and transient measurements, have significantly advanced our understanding of this process.2

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Section: Introductionmentioning

confidence: 99%

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Gao

Inganäs

2014

Phys. Chem. Chem. Phys.

204

252

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“…The HOMO/LUMO levels of PBDTTT-C, Cy7 and PC 70 BM are 5.4/3.9 eV [63], 5.2/4.2 eV [53] and 6.1/4.3 eV [64], respectively, summarized in Figure 1(c). The energy levels allow speculations at which interfaces exciton dissociation can take place and through which phases charge can be transported to the electrode.…”

Section: Resultsmentioning

confidence: 99%

Insights into photovoltaic properties of ternary organic solar cells from phase diagrams

Makha

Schwaller

Strassel

et al. 2018

Science and Technology of Advanced Materials

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The efficiency of ternary organic solar cells relies on the spontaneous establishment of a nanostructured network of donor and acceptor phases during film formation. A fundamental understanding of phase composition and arrangement and correlations to photovoltaic device parameters is of utmost relevance for both science and technology. We demonstrate a general approach to understanding solar cell behavior from simple thermodynamic principles. For two ternary blend systems we construct and model phase diagrams. Details of EQE and solar cell parameters can be understood from the phase behavior. Our blend system is composed of PC70BM, PBDTTT-C and a near-infrared absorbing cyanine dye. Cyanine dyes are accompanied by counterions, which, in a first approximation, do not change the photophysical properties of the dye, but strongly influence the morphology of the ternary blend. We argue that counterion dissociation is responsible for different mixing behavior. For the dye with a hexafluorophosphate counterion a hierarchical morphology develops, the dye phase separates on a large scale from PC70BM and cannot contribute to photocurrent. Differently, a cyanine dye with a TRISPHAT counterion shows partial miscibility with PC70BM. A large two-phase region dictated by the PC70BM: PBDTTT-C mixture is present and the dye greatly contributes to the short-circuit current.

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“…6,7 In this context, a variety of π-conjugated electron-rich components represented by dithieno [3,2- 9 have been developed and utilized as donor units in D-A copolymers. On the other hand, the development of new acceptor units is still vital for synthesizing D-A copolymers because effective acceptor units are limited to 2,1,3-benzothiadiazole, 8 diketopyrrolopyrrole, 10 thieno [3,4-c]pyrole-4, 6-dione, 11 thieno [3,4-b]thiophene with electron-withdrawing substitutents 12 and naphtho[1,2-c:5,6-c']bis [1,2,5]thiadiazole. 13 We have investigated the development of new electron-accepting materials for n-channel organic field-effect transistors (OFETs) and have applied the developed electron-deficient units to D-A copolymers for OPVs.…”

Section: Introductionmentioning

confidence: 99%

Development of donor–acceptor copolymers based on dioxocycloalkene-annelated thiophenes as acceptor units for organic photovoltaic materials

Aso

2016

Polym J

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Organic photovoltaics (OPVs) have attracted considerable attention over the past two decades not only because of their potential for generating renewable energy but also because of their favorable properties, such as low cost, low weight, solution processability and large-area manufacturability. The active layer of OPVs is based on the concept of the bulk-heterojunction configuration, which comprises a blend of a π-conjugated polymer as an electron donor (p-type) and a fullerene derivative as an electron acceptor (n-type). Donor-acceptor (D-A) copolymers have been utilized as efficient p-type materials in OPVs. In this review, we will focus on a series of dioxocycloalkene-annelated thiophenes as novel acceptor units and summarize photophysical and electrochemical properties of D-A copolymers that contain these acceptor units as well as their OPV performance in combination with [6,6]-phenyl-C x -butyric acid methyl ester (x = 61 or 71). These systematic investigations will provide important insight for the development of high-performance D-A-type OPV materials.

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Polymer solar cells with enhanced open-circuit voltage and efficiency

Cited by 3,031 publications

References 34 publications

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Insights into photovoltaic properties of ternary organic solar cells from phase diagrams

Development of donor–acceptor copolymers based on dioxocycloalkene-annelated thiophenes as acceptor units for organic photovoltaic materials

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