Inverted organic photovoltaic cells

Wang, Kai; Liu, Chang; Meng, Tianyu; Yi, Chao; Gong, Xiong

doi:10.1039/c5cs00831j

Cited by 188 publications

(130 citation statements)

References 435 publications

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“…Contrarily, the infiltration of P3HT is the optimum for 10-FZNR device and this implies that a larger interfacial area is available for charge separation and collection process. It is acknowledged that the IPCE of a device is closely associated with the photoabsorption ability of the photoactive layer1219. Considering that there is negligible difference in the photoabsorption ability of 10-FZNR and 12-FZNR sample in this region (Fig.…”

Section: Resultsmentioning

confidence: 98%

Controlled Defects of Fluorine-incorporated ZnO Nanorods for Photovoltaic Enhancement

Lee

Ginting

Tan

et al. 2016

Sci Rep

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Anion passivation effect on metal-oxide nano-architecture offers a highly controllable platform for improving charge selectivity and extraction, with direct relevance to their implementation in hybrid solar cells. In current work, we demonstrated the incorporation of fluorine (F) as an anion dopant to address the defect-rich nature of ZnO nanorods (ZNR) and improve the feasibility of its role as electron acceptor. The detailed morphology evolution and defect engineering on ZNR were studied as a function of F-doping concentration (x). Specifically, the rod-shaped arrays of ZnO were transformed into taper-shaped arrays at high x. A hypsochromic shift was observed in optical energy band gap due to the Burstein-Moss effect. A substantial suppression on intrinsic defects in ZnO lattice directly epitomized the novel role of fluorine as an oxygen defect quencher. The results show that 10-FZNR/P3HT device exhibited two-fold higher power conversion efficiency than the pristine ZNR/P3HT device, primarily due to the reduced Schottky defects and charge transfer barrier. Essentially, the reported findings yielded insights on the functions of fluorine on (i) surface –OH passivation, (ii) oxygen vacancies (Vo) occupation and (iii) lattice oxygen substitution, thereby enhancing the photo-physical processes, carrier mobility and concentration of FZNR based device.

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Section: Resultsmentioning

confidence: 98%

Controlled Defects of Fluorine-incorporated ZnO Nanorods for Photovoltaic Enhancement

Lee

Ginting

Tan

et al. 2016

Sci Rep

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“…[1][2][3][4][5][6] The power conversion efficiency (PCE) of OPVs has already been achieved around 13% [7][8][9] by virtue of the recent tremendous progress in designing new organic materials and optimizing the device architecture. [1][2][3][4][5][6] The power conversion efficiency (PCE) of OPVs has already been achieved around 13% [7][8][9] by virtue of the recent tremendous progress in designing new organic materials and optimizing the device architecture.…”

Section: Introductionmentioning

confidence: 99%

Toward Predicting Efficiency of Organic Solar Cells via Machine Learning and Improved Descriptors

Sahu

Rao

Troisi

et al. 2018

Advanced Energy Materials

173

214

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include the strong electron-electron interactions and strong electron-phonon couplings as well as the complicated donor/ acceptor (D/A) interface morphology, which are fundamentally different from inorganic semiconductors. [23,24] Therefore, the accurate simulating of OPVs requires high-level theoretical methods in quantum chemistry, quantum dynamics and statistical mechanics, and in recent years there have been substantial progress for the theoretical understanding of many microscopic processes such as charge transport, [25] exciton dissociation, [26,27] singlet fission, [28][29][30] etc. These methods are useful for few benchmark systems but cannot be used to explore the chemical space, i.e., screen a large number of candidate materials.The predictive power of a theoretical model by high-throughput virtual screening has been explored in the recent years. [31][32][33][34][35][36][37][38][39][40] For example, in the Harvard Clean Energy Project (CEP), [41] Aspuru-Guzik and co-workers have screened ≈2.3 million compounds by employing the Scharber model [42,43] to find out efficient new donor molecules for OPVs. Here, the computed energies of the highest occupied molecular orbital (HOMO)/the lowest unoccupied molecular orbital (LUMO) of organic molecules are calibrated to experimentally determined values, and then employing an averaging scheme, energies of HOMO/LUMO are estimated to use them as input in the Scharber model. However, the prediction of PCE of an OPV is much more challenging compared to the energies of orbitals. Very recently, the same research team [44] noticed that the Scharber model, widely used in these virtual screening works, is not accurate enough for the prediction of PCE, and calibration of PCE by considering molecular similarity, molecular weight and band gap energy leads to improvement in correlation between experimental (49 OPVs) and calculated PCE (Pearson's coefficient (r) is increased from 0.30 to 0.43). Further, the Scharber model is only optimized for the PC 61 BM acceptor [42] and a more general model is desired to take account of nonfullerene molecules.In an OPV, energy conversion is accomplished by four consecutive steps: i) absorption of photons and exciton formation, ii) exciton diffusion to D/A interface, iii) exciton dissociation, and iv) transport of holes/electrons to the respective electrode. Taking account of all these processes, the efficiency of a device depends on many microscopic properties of the organic material such as optical gap, charge-carrier mobility, ionization To design efficient materials for organic photovoltaics (OPVs), it is essential to identify the largest number of parameters that control their properties and build a model using these parameters (known as descriptors) for the prediction of the power conversion efficiency (PCE). By constructing a dataset for 280 small molecule OPV systems, it is found that for all high-performing devices, frontier molecular orbitals of donor molecules are nearly degenerated and in such cases, orbitals other than just high...

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“…Organic photovoltaic (OPV) devices have emerged as attractive candidates for solar energy harvesting in the urban environment due to their lightweight design and potential for inexpensive manufacturing through solution‐based deposition processes . The typical device architecture is based on a bulk heterojunction (BHJ) sandwiched between two electrodes, where the BHJ consists of an intimate blend of an electron donor (typically a conjugated polymer) and an electron acceptor (commonly a fullerene derivative).…”

Section: Introductionmentioning

confidence: 99%

Molecular design of interfacial layers based on conjugated polythiophenes for polymer and hybrid solar cells

Houston

Richeter

Clément

et al. 2017

Polymer International

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In the past two decades, bulk heterojunction organic photovoltaic (OPV) devices have emerged as attractive candidates for solar energy conversion due to their lightweight design and potential for low‐cost, high‐throughput, solution‐phase processability. Interfacial engineering is a proven efficient approach to achieve OPV devices with high power conversion efficiencies. This mini‐review provides an overview of the key structural considerations necessary when undertaking the molecular design of conjugated polyelectrolytes, for application as interfacial layers (ILs). The different roles of ILs are outlined, together with the advantages and disadvantages of competing classes of IL materials. Particular emphasis is placed on the design and synthesis of water‐soluble polythiophene‐based IL materials and the influence of their structural characteristics on their performance as a promising class of IL material. Finally, the challenges and opportunities for polythiophenes as IL materials for OPV devices and other solution‐processed solar cell technologies (e.g. perovskite solar cells) are discussed. © 2017 Society of Chemical Industry

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Inverted organic photovoltaic cells

Cited by 188 publications

References 435 publications

Controlled Defects of Fluorine-incorporated ZnO Nanorods for Photovoltaic Enhancement

Controlled Defects of Fluorine-incorporated ZnO Nanorods for Photovoltaic Enhancement

Toward Predicting Efficiency of Organic Solar Cells via Machine Learning and Improved Descriptors

Molecular design of interfacial layers based on conjugated polythiophenes for polymer and hybrid solar cells

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