Enhancement of power conversion efficiency of PTB7:PCBM-based solar cells by gate bias

Zhou, Miao; Sun, Qinjun; Gao, Liyan; Wu, Jun Qiang; Zhou, Shaolong; Li, Zhanfeng; Hao, Yuying; Shi, Fang

doi:10.1016/j.orgel.2016.02.003

Cited by 12 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, major photo-conduct is to the benefit of restraining charge recombination and prompting electron to extract in PSCs. Thus, it is important for improving conductivity to restrain interfacial charges recombination and enhance charges extraction, electron/hole-transporting ability [32][33]. The following discussion further confirmes that CZO acts as ETL, accounting for the theory of FF enhancement in doped system.…”

Section: Resultssupporting

confidence: 63%

“…The following discussion further confirmes that CZO acts as ETL, accounting for the theory of FF enhancement in doped system. The J-V curves of electron-only (μe ) devices along with individual Cd-doped ratios are shown in Fig (d), we elucidate the carrier mobilities of ETL by adopting the space-charge limited current (SCLC) model [33][34][35][36][37]. Electron-only devices were manufactured (ITO/CZO/PTB7-Th:…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance

Ren

Qing

et al. 2019

Preprint

View full text Add to dashboard Cite

In this work, electron transport layers (ETLs)with high charge transfer ability was fabricated by doping ZnO nanoparticles with different concentrations of cadmium. The performance for an inverted polymer solar cell based on PTB7-Th: PC71BM with 5% cadmium doping of zinc oxide nanoparticles (CZO) ETL is better than pure ZnO,which can enhance the short-circuit current (J SC), from 16.30 mA/cm2 to 17.15 mA/cm2, the fill factor (FF) from 64.45% to 69.38%, power conversion efficiency（PCE）from 8.09% to 9.28%. It's consequence of performance stems from curbing interfacial charge recombination and effective charge extraction. Meanwhile, Taking a series of characterization methods, such as atomic force microscopy (AFM), the space charge limited current (SCLC), transmittance, the charge dissociation probabilities (P(E,T)), photo-electrochemical impedance spectroscopy (EIS). The results indicate that the electrical conductivity and transmittance of the films are improved by incorporation of Cd in the ZnO film, restrained surface charge recombination and enhanced the electron-transport capability. Therefore, the ETL of Cd-doped will be an ideal candidate for future optoelectronic devices.

show abstract

Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance

Ren

Qing

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…The V eff is defined as V eff = V 0 − V a , where V 0 is the voltage when J ph = 0 and V a is the applied bias voltage . At high effective voltage ( V eff ), it is assumed that the exciton dissociation efficiency and charge carrier collection efficiency are unity, implying that the saturation current density ( J sat ) is mainly determined by the maximum exciton generation rates ( G max ) . As a result, J sat = qLG max , where q is the elementary charge and L is the thickness of 175 nm of the active layers.…”

Section: Resultsmentioning

confidence: 99%

An eco‐friendly water‐soluble fluorene‐based polyelectrolyte as interfacial layer for efficient inverted polymer solar cells

Peng

et al. 2018

Polymers for Advanced Techs

View full text Add to dashboard Cite

A conjugated polyelectrolyte poly (9,9-bis(3′-[(N,N-dimethyl)-N-ethylammonium]-propyl)-2,7-fluorene dibromide) (PFBr) with the feature of environmental friendliness and cheapness was successfully used in polymer solar cells (PSCs) as the cathode interfacial layer (CIL). And we successfully demonstrate that the PFBr can build interfacial dipoles at the CIL/cathode interfaces, leading to reduce cathode work functions and improve open-circuit voltages, which decrease interfacial energy loss at the cathode. It not only improves the electron transfer efficiency but also inhibits the charge carrier recombination at the contact interface. Impedance spectra revealed that the optimal device with the smallest charge transport time constant of 2.83 microseconds was achieved under the concentration of 2 mg mL −1 of PFBr, which suggests efficient electron transport on the interface between the organic active layer and the indium tin oxide cathode. Moreover, as a consequence, the power conversion efficiency of the PSCs increases to 3.83% (with PFBr as CIL) from 1.89% (without any CIL), based on the poly(3-hexylthiophene) and [6,6]-phenyl C 61 -butyric acid methyl ester bulk heterojunction active layer. Therefore, our observation can demonstrate PFBr is a prospective candidate as CIL for constructing low-cost, largearea, and flexible PSCs. KEYWORDS cathode interfacial layer, electrochemical impedance spectroscopy, PFBr, polymer solar cells, scanning Kelvin probe microscope 1 | INTRODUCTION Photovoltaic technology provides an environmentally friendly and sustainable power supply for overcoming the global energy crisis. 1,2 In particular, bulk heterojunction polymer solar cells (PSCs) have attracted great attention during recent decades, owing to the excellent merits of lightweight, flexible low-cost, and large-area devices through solution processing. 3-5 Recent great progresses have been made by controlling the active layer morphology by posttreatment methods, 6 developing novel interfacial layers, 7 active materials, and new device structures with enlarged donor/acceptor interface. 8 As known, there are 2 main device structures of PSCs. The commonly adopted device structure of regular PSCs consists of indium tin oxide (ITO)/PEDOT:PSS (hole transport layer)/active layer/electron transport layer/low-work-function metal cathode (such as Ca and Al). It has been proved that the lifetime for regular PSCs is poor, because of the reactive metal cathode with a low-work function, which can be easily oxidized in air, and the hole-collecting interlayer of acidic and hygroscopic PEDOT:PSS etching of the ITO. As an alternative, there has been an increased interest in inverted PSCs (i-PSCs), in which the charge-collecting nature of the electrodes is reversed; that is, modified ITO is used as the cathode, and a high-work-function metal (such as Ag) is used as the anode. The i-PSCs have attracted more and more research because it provides not only long-term stability but also flexibility in the design and fabrication for advanced PSCs.For achi...

show abstract

“…Here, we determined the values of the J sat at approximately 2.6 V which is presented in Figure A, and we know Equation

J_{sat} = {qG}_{\max} L

where q is the elementary charge, L is the thickness of the active layer, and G max is the maximum exciton generation rates . As a result, the value of P(E,T) at any V eff can be obtained from the plot of the normalized photocurrent density ( J ph / J sat ) with respect to V eff as showed in Figure B .…”

Section: Resultsmentioning

confidence: 99%

Enhanced efficiency of ternary organic solar cells by doping a polymer material in P3HT:PC₆₁BM

Wang

et al. 2017

Polymers for Advanced Techs

View full text Add to dashboard Cite

Doping a low-bandgap polymer material (PDTBDT-DTNT) as a complementary electron donor in poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C 61 -butyricacid methyl ester (PC 61 BM) blend is experimented to improve the power conversion efficiency (PCE) of organic solar cells (OSCs).The PCE of OSCs was increased from 3.19% to 3.75% by doping 10 wt% PDTBDT-DTNT, which was 17.55% higher than that of the OSCs based on binary blend of P3HT:PC 61 BM (host cells).The short-circuit current density (J sc ) was increased to 10.11 mA·cm −2 compared with the host cells. Although the PCE improvement could partly be attributed to more photon harvest for complementary absorption of 2 donors by doping appropriate PDTBDT-DTNT, the promotion of charge separation and transport as well as the suppression of charge recombination due to a matrix of cascade energy levels is also important. And the better morphology of the active layer films is beneficial to the optimized performance of ternary devices.

show abstract

Enhancement of power conversion efficiency of PTB7:PCBM-based solar cells by gate bias

Cited by 12 publications

References 37 publications

Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance

Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance

An eco‐friendly water‐soluble fluorene‐based polyelectrolyte as interfacial layer for efficient inverted polymer solar cells

Enhanced efficiency of ternary organic solar cells by doping a polymer material in P3HT:PC₆₁BM

Contact Info

Product

Resources

About

Enhancement of power conversion efficiency of PTB7:PCBM-based solar cells by gate bias

Cited by 12 publications

References 37 publications

Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance

Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance

An eco‐friendly water‐soluble fluorene‐based polyelectrolyte as interfacial layer for efficient inverted polymer solar cells

Enhanced efficiency of ternary organic solar cells by doping a polymer material in P3HT:PC61BM

Contact Info

Product

Resources

About

Enhanced efficiency of ternary organic solar cells by doping a polymer material in P3HT:PC₆₁BM