Energy Level Tuning of PEDOT:PSS for High Performance Tin‐Lead Mixed Perovskite Solar Cells

Tang, Hao; Shang, Yuequn; Zhou, Wenjia; Peng, Zijian; Ning, Zhijun

doi:10.1002/solr.201800256

Cited by 68 publications

(54 citation statements)

References 39 publications

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“…These results indicate that the solvent processing has different structuring mechanisms depending on the solvent nature. This finding is crucial for modifying the PEDOT:PSS film's properties for various applications, like transparent hole transport layer in the field of solar cells, [ 32–34 ] neuromorphic functional materials, [ 35,36 ] and bio‐sensing. [ 37,38 ]…”

Section: Resultsmentioning

confidence: 99%

Role of the Processing Solvent on the Electrical Conductivity of PEDOT:PSS

Dong

Portale

2020

Adv Materials Inter

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addition, solvent-thermal post-treatment, organic-inorganic blending, and even film stretching. [1] Different compounds like polar solvents, salt, strong acids, ionic liquids, carbon nanotube, e.g., were utilized as additives, post-treatment agents, or blending components. For example, Saxena et al. post-treated pristine PEDOT:PSS films with various ionic liquids to induce an increased π-π stacking between PEDOT molecules. [4] 1-ethyl-3-methylimidazolium tetracyanoborate (EMIM TCB) treated films exhibited a record short π-π stacking distance of 3.35 Å due to an enormous bonding effect of TCB to PEDOT and EMIM to PSS and subsequent phase separation. Fan et al. reported an impressive electrical conductivity of 3088 S cm −1 after the exposure of PEDOT:PSS:5% DMSO (dimethyl sulfoxide) films with sulfuric acid. [3] Worfolk et al. reported solution sheared PEDOT:PSS films further posttreated with methanol with extremely high conductivity of 4600 S cm −1. [2] Among various strategies, polar solvents addition and post-treatment are among the most used and most efficient ways to improve PEDOT:PSS electrical conductivity. [1,5-8] Both processes can induce different effects on PEDOT:PSS thin films, such as π-π stacking distance shortening (i.e., increased π-π orbital overlap), alteration of the crystallite orientation (face-on vs edge-on), overall crystallinity increase, PSS removal, and phase separation. [9,10] Polar solvents with high dielectric constants and high boiling points are common additives and post-treatment agents, especially DMSO and EG (ethylene glycol). In 2002, Kim et al. reported for the first time about the use of DMSO as an additive to dramatically increased the conductivity of PEDOT:PSS thin films (about two orders of magnitude higher at room temperature), and since then polar solvents got more and more attention from the research field. [11,12] Pipe et al. reported a promising thermoelectric property for PEDOT:PSS by EG dip treatment following pre-doping PEDOT:PSS nanofilms with DMSO or EG. [13] The DMSO and EG pre-doped films exhibited σ > 600 S cm −1. After dipping them into an EG bath, conductivities up to 1000 S cm −1 were obtained, which were three orders of magnitude higher than pristine PEDOT:PSS. The effective improvement was mainly attributed to the selective removal of excessive PSS. Palumbiny et al. observed that the in-plane electrical conductivity of PEDOT:PSS increased from 0.2 to 1200 S cm −1 upon EG treatment. The authors drew the emphasis on the formation of larger PEDOT crystallites with more pronounced Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is one of the most studied conductive polymers, holding great potential in many applications such as thermoelectric generators, solar cells, and memristors. Great efforts have been invested in trying to improve its mechanical and electrical properties and to elucidate the structure-property relationship. In this work, a systematic and quantitative study of the effect of solvent polarity and solution processing on the f...

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Section: Resultsmentioning

confidence: 99%

Role of the Processing Solvent on the Electrical Conductivity of PEDOT:PSS

Dong

Portale

2020

Adv Materials Inter

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“…Ning and co‐workers reported that using a perfluorinated ionomer (PFI) to modulate the PEDOT:PSS layer could tune the work function of HTL from −5.02 to −5.19 eV, thus bringing a smaller band mismatching at the perovskite/HTL interface. The PFI modified PSC has a PCE of 15.85%, featuring a V OC of 0.783 V which is about 50 mV higher than that of the reference device …”

Section: The Status Of Mixed Sn‐pb Pscsmentioning

confidence: 91%

“…Lastly, the band energy level alignments at the perovskite/ETL and perovskite/HTL interfaces are critical for the performance of PSCs. The ETL and HTL materials commonly used in the Pb‐based PSCs may not be suitable for the mixed Sn‐Pb PSCs . If these issues could be addressed with the use of proper HTL and ETL, the performance of the regular structure mixed Sn‐Pb PSCs is expected to be greatly improved.…”

Section: The Status Of Mixed Sn‐pb Pscsmentioning

confidence: 99%

Low‐Bandgap Mixed Tin‐Lead Perovskites and Their Applications in All‐Perovskite Tandem Solar Cells

Wang

Song

et al. 2019

Adv Funct Materials

151

139

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Efficient organic-inorganic metal halide perovskite absorbers have gained tremendous research interest in the past decade due to their super optoelectronic properties and defect tolerance. Lead (Pb) halide perovskites enable highly efficient perovskite solar cells (PSCs) with a record power conversion efficiency (PCE) of over 23%. However, the energy bandgaps of Pb halide perovskites are larger than the optimal bandgap for single junction solar cells, governed by the Shockley-Queisser (SQ) radiative limit. Mixed tin (Sn)-Pb halide perovskites have drawn significant attention, since their bandgap can be tuned to below 1.2 eV, which opens a door for fabricating all-perovskite tandem solar cells that can break the SQ radiative limit. This review summarizes the development of low-bandgap mixed Sn-Pb PSCs and their applications in all-perovskite tandem solar cells. Its aim is to facilitate the development of new approaches to achieve high efficiency low-bandgap single-junction mixed Sn-Pb PSCs and all-perovskite tandem solar cells.

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“…The W F of PEDOT:PSS mixed with PFI increased from 4.71 to 5.41 eV, which leads to the subtle increase in V OC from 0.59 to 0.62 V for P3HT:PC 61 BM based OSCs. [255] For PerSCs, PFI-PEDOT:PSS displayed improved V OC of 0.05-0.15 V. [256,257] However, it should be noted that the increased work function does not necessarily improve the V OC . Interaction between HTL and active layer is important for charge collection.…”

Section: Modification Of Pedot Htlmentioning

confidence: 99%

Recent Advances of Synthesis, Properties, Film Fabrication Methods, Modifications of Poly(3,4‐ethylenedioxythiophene), and Applications in Solution‐Processed Photovoltaics

Jiang

Liu

Zhou

2020

Adv Funct Materials

126

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Poly(3,4‐ethylenedioxythiophene) (PEDOT) is a very unique polymer. It can be very conductive, highly transparent, and environmentally stable. It is highly switchable between its oxidation state and neutral state. It forms a micellar complex with polystyrene sulfonate in aqueous conditions, and then can be solution‐processible and printable. Based on these advantages, PEDOT has been widely used as conductors and transparent electrodes in electronics and optoelectronics. The device performance is highly correlated with the structure and properties of PEDOT. In this review, advances in the synthesis, optoelectronic and chemical properties are comprehensively described and analyzed, as well as the strategies for tuning these properties to fulfill the requirement for device applications. Film processing techniques (printing and transfer printing) for the conducting polymer are also presented. Then, the applications of PEDOT as conductors for versatile organic and perovskite solar cells (single‐junction, tandem, semitransparent, colorful, flexible and ultraflexible, fully printed solar cells) are summarized. Finally future study directions for PEDOT in terms of conductivity enhancement and application‐oriented formulations are discussed.

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Energy Level Tuning of PEDOT:PSS for High Performance Tin‐Lead Mixed Perovskite Solar Cells

Cited by 68 publications

References 39 publications

Role of the Processing Solvent on the Electrical Conductivity of PEDOT:PSS

Role of the Processing Solvent on the Electrical Conductivity of PEDOT:PSS

Low‐Bandgap Mixed Tin‐Lead Perovskites and Their Applications in All‐Perovskite Tandem Solar Cells

Recent Advances of Synthesis, Properties, Film Fabrication Methods, Modifications of Poly(3,4‐ethylenedioxythiophene), and Applications in Solution‐Processed Photovoltaics

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