Highly efficient inverted bulk-heterojunction solar cells with a gradiently-doped ZnO layer

Nho, Sungho; Baek, Gyoelim; Park, Sujung; Lee, Bo Ram; Joo, Myung; Lim, Dong Chan; Seo, Jung Hwa; Oh, Seung‐Hwan; Song, Myoung Hoon; Cho, Shinuk

doi:10.1039/c5ee03045e

Cited by 97 publications

(53 citation statements)

References 32 publications

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“…Among the PBDTTT derivatives, the representative materials were poly[4,8‐bis[(2‐ethylhexyl)oxy]benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl][3‐fluoro‐2‐[(2‐ethyl hexyl)carbonyl]thieno[3,4‐b]thiophenediyl]] (PTB7) and poly[[2,6′‐4,8‐di(5‐ethylhexylthienyl)benzo[1,2‐b;3,3‐b]dithiophene][3‐fluoro‐2[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl]] (PTB7‐Th) (Figure a) . Liang et al reported a high PCE of 7.4% in PTB7:PC 70 BM OSCs .…”

Section: Device Efficiencymentioning

confidence: 99%

“…After optimizing the device fabrication of PTB7:PC 70 BM OSCs, He et al reported a dramatically improved PCE of 9.2% . Recently, Nho et al reported a PCE of 10.08% in OSCs based on PTB7 by modifying the device architecture . PTB7‐Th is a modified PTB7 polymer; the 2‐ethylhexyl‐thienyl group was introduced into the BDT moiety, thereby leading to a deeper HOMO with a narrow E g .…”

Section: Device Efficiencymentioning

confidence: 99%

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Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

et al. 2016

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The past two decades of vigorous interdisciplinary approaches has seen tremendous breakthroughs in both scientific and technological developments of bulk-heterojunction organic solar cells (OSCs) based on nanocomposites of π-conjugated organic semiconductors. Because of their unique functionalities, the OSC field is expected to enable innovative photovoltaic applications that can be difficult to achieve using traditional inorganic solar cells: OSCs are printable, portable, wearable, disposable, biocompatible, and attachable to curved surfaces. The ultimate objective of this field is to develop cost-effective, stable, and high-performance photovoltaic modules fabricated on large-area flexible plastic substrates via high-volume/throughput roll-to-roll printing processing and thus achieve the practical implementation of OSCs. Recently, intensive research efforts into the development of organic materials, processing techniques, interface engineering, and device architectures have led to a remarkable improvement in power conversion efficiencies, exceeding 11%, which has finally brought OSCs close to commercialization. Current research interests are expanding from academic to industrial viewpoints to improve device stability and compatibility with large-scale printing processes, which must be addressed to realize viable applications. Here, both academic and industrial issues are reviewed by highlighting historically monumental research results and recent state-of-the-art progress in OSCs. Moreover, perspectives on five core technologies that affect the realization of the practical use of OSCs are presented, including device efficiency, device stability, flexible and transparent electrodes, module designs, and printing techniques.

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Section: Device Efficiencymentioning

confidence: 99%

Section: Device Efficiencymentioning

confidence: 99%

Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

et al. 2016

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“…[34] Our previousw ork indicated that poly [9,9-bis(4-sulfonatobutyl)-2,7-fluorene]-alt-2,7-(9,9-bis{2-[2-(2-methoxyethoxy)ethoxy]ethyl}fluorene) (PF EO SO 3 Na) with sodium sulfonate and PEO derivatives in the side chains shows excellent electron-transport properties in polymer light-emitting devices and polymers olar cells. [38] These phenomenac an be explained by the fact that Li prefers to be located at Zn sites as an acceptor and simultaneously reduces the density of oxygen at the site because the ionic radius of Li (0.76 )i sv ery closet ot hat of Zn (0.74 ). demonstrated that the intrinsic surfaced efects of ZnO are dramatically restrained if it is doped with as mall quantity of Li.…”

Section: Introductionmentioning

confidence: 99%

Lithium‐Ion‐Based Conjugated Polyelectrolyte as an Interface Material for Efficient and Stable Non‐Fullerene Organic Solar Cells

Liu

et al. 2019

ChemSusChem

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An eco‐friendly n‐type water/alcohol‐soluble conjugated polyelectrolyte PFEOSO3Li was synthesized and applied as a cathode interfacial layer in organic solar cells. The π‐delocalized polyfluorene backbone has an intimate connection with the hydrophobic active layer, and the side chain with lithium ion may move toward the ZnO layer through the self‐assembly property of conjugated polyelectrolytes. UV photoelectron spectroscopy indicated that modification with PFEOSO3Li dramatically lowers the work function of indium‐doped tin oxide (ITO)/ZnO and may form strong interfacial dipoles between ZnO and the active layer. Meanwhile, introduction of lithium ions as spectator cations may contribute to reduction of the intrinsic surface defects of ZnO. The green emission in the photoluminescence spectrum of ZnO disappeared after modification with PFEOSO3Li. In addition, the roughness of ZnO barely changed after coating with PFEOSO3Li, and the surface became more hydrophobic, which demonstrates that the thin conjugated polyelectrolyte layer exhibits good adhesion with both ZnO and the active layer. These phenomena indicate that the introduction of PFEOSO3Li makes ITO/ZnO an efficient cathode. As a result, inverted organic solar cell devices with ZnO/PFEOSO3Li double‐interlayers exhibit high efficiencies of 11.7 and 10.6 % for PBDB‐T:IT‐M and PBDB‐T:ITIC blend systems, respectively.

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“…Thus, there have been outstanding improvements, with the power conversion efficiency (PCE) reaching up to 13%. These achievements can be accomplished via the synthesis of efficient conjugated polymers/oligomers or through device engineering …”

Section: Introductionmentioning

confidence: 99%

Simple Approach to Overcome Thickness Tolerance of Interlayer without Sacrificing the Performances of Polymer Solar Cells

Jeong

Jin

Moon

et al. 2019

Adv Materials Inter

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Highly efficient inverted bulk-heterojunction solar cells with a gradiently-doped ZnO layer

Abstract: Highly efficient inverted BHJ solar cells were demonstrated using a wet-chemically prepared doped ZnO layer with a self-organized ripple nanostructure. The solar cell based on PTB7 and PC71BM with Li2CO3-doped ZnO layer yielded a maximum efficiency of 10.08%.

Cited by 97 publications

References 32 publications

Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

Lithium‐Ion‐Based Conjugated Polyelectrolyte as an Interface Material for Efficient and Stable Non‐Fullerene Organic Solar Cells

Simple Approach to Overcome Thickness Tolerance of Interlayer without Sacrificing the Performances of Polymer Solar Cells

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