Panchromatic Sequentially Cast Ternary Polymer Solar Cells

Ghasemi, Masoud; Ye, Long; Zhang, Qianqian; Yan, Liang; Kim, Joo Hyun; Awartani, Omar; You, Wei; Gadisa, Abay; Ade, Harald

doi:10.1002/adma.201604603

Cited by 93 publications

(99 citation statements)

References 69 publications

(122 reference statements)

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“…By using SMAs with similar surface tensions prior to ternary device fabrication, we were able to predict whether the molecular acceptors have the potential to form reasonably small domains. [79] However, if the mechanical alloy leads to the formation of new electronic states, the Coherence lengths are calculated using Scherrer equation based on the full width at half-maximum of each peak; b) Obtained by fitting the peaks at Q values around 0.47, which is assigned to the ITIC-Th (100) scattering. [16,63,73,78] Such close contact could potentially lead to the formation of a mechanical alloy, which alone may not be beneficial for device performance.…”

Section: The Role Of Surface Tension and Interfacial Tensionmentioning

confidence: 99%

Multiple Cases of Efficient Nonfullerene Ternary Organic Solar Cells Enabled by an Effective Morphology Control Method

Jiang

Zhang

Yang

et al. 2017

Advanced Energy Materials

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148

114

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of multijunction architecture increases the absorption breadth of a solar cell device, the difficulty of device fabrication and therefore the cost for large-scale production are significantly raised. To maintain the simplicity of the single junction structure and in the meantime broaden the absorption range of the solar cell, ternary OSCs have been developed where two donors and one acceptor or one donor and two acceptors are blended together to form the active layer. Important advances have been realized for ternary OSCs with best PCEs reaching beyond 10%. [11,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] However, one main constraint that slows down the development of ternary OSC is the difficulty in controlling the morphology of ternary blends. It is commonly accepted that the bulk-heterojunction (BHJ) morphology for a two-component system is already complex. [25,[30][31][32][33][34] A threephase model has been generally utilized to describe the complicated morphology where a relatively pure donor phase, a relatively pure acceptor phase, and a intermixed donor:acceptor phase coexist in the active medium. [35][36][37][38][39][40][41][42] Apparently, the morphology formed by ternary blends would be even more challenging to evaluate. Due to the absence of effective methods to control the morphology, most of the previous reports on ternary OSCs only focused on one single material combination, Ternary organic solar cells (OSCs) have attracted much research attention, as they can maintain the simplicity of the single-junction device architecture while broadening the absorption range of OSCs. However, one main challenge that limits the development of ternary OSCs is the difficulty in controlling the morphology of ternary OSCs. In this paper, an effective approach to control the morphology is presented that leads to multiple cases of efficient nonfullerene ternary OSCs with efficiencies of up to 11.2%. This approach is based on a donor polymer with strong temperature dependent aggregation properties processed from hot solutions without any solvent additives and a pair of small molecular acceptors (SMAs) that have similar surface tensions and thus low propensity to form discrete phases. Such a ternary blend exhibits a simplified bulk-heterojunction morphology that is similar to the morphology of previously reported binary blends. As a result, an almost linear relationship between V OC and film composition is observed for all nonfullerene ternary devices. Meanwhile, by carefully designing a control system with a large interfacial tension, a different phase separation and V OC dependence is demonstrated. This morphology control approach can be applicable to more material systems and accelerates the development of the ternary OSC field.

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Section: The Role Of Surface Tension and Interfacial Tensionmentioning

confidence: 99%

Multiple Cases of Efficient Nonfullerene Ternary Organic Solar Cells Enabled by an Effective Morphology Control Method

Jiang

Zhang

Yang

et al. 2017

Advanced Energy Materials

Self Cite

148

114

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“…Recently, scientists proposed a novel method to continuously spin‐coat two kinds of blending solutions of FTAZ:PC 71 BM and PDPP3T:PC 71 BM. At the same time, it is also reported that an additional acceptor layer (IDIC) was inserted between the binary system active layer (PTB7‐Th:PC 71 BM) and ZnO electron transport layer to increase the device efficiency 30,31. However, such a method is unable to separate the donors and the acceptors, the vertical phase separation of the active layers are still not well regulated.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, it is also reported that an additional acceptor layer (IDIC) was inserted between the binary system active layer (PTB7-Th:PC 71 BM) and ZnO electron transport layer to increase the device efficiency. [30,31] However, such a method is unable to separate the donors and the acceptors, the vertical phase separation of the active layers are still not well regulated. There are also related literature reporting the use of orthogonal solvents or simultaneously…”

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confidence: 99%

High‐Performance Pseudoplanar Heterojunction Ternary Organic Solar Cells with Nonfullerene Alloyed Acceptor

Wan

Zhang

et al. 2020

Adv Funct Materials

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The vast majority of ternary organic solar cells are obtained by simply fabricating bulk heterojunction (BHJ) active layers. Due to the inappropriate distribution of donors and acceptors in the vertical direction, a new method by fabricating pseudoplanar heterojunction (PPHJ) ternary organic solar cells is proposed to better modulate the morphology of active layer. The pseudoplanar heterojunction ternary organic solar cells (P‐ternary) are fabricated by a sequential solution treatment technique, in which the donor and acceptor mixture blends are sequentially spin‐coated. As a consequence, a higher power conversion efficiency (PCE) of 14.2% is achieved with a Voc of 0.79 V, Jsc of 25.6 mA cm−2, and fill factor (FF) of 69.8% compared with the ternary BHJ system of 13.8%. At the same time, the alloyed acceptor is likely formed between two the acceptors through a series of in‐depth explorations. This work suggests that nonfullerene alloyed acceptor may have great potential to realize effective P‐ternary organic solar cells.

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“…[1][2][3] It has been recognized as a great promising substitute for siliconbased photovoltaic with advantages of light weight, inexpensive cost, and largearea flexible preparation with roll-to-roll (R2R) process. [14,[21][22][23][24][25][26][27] As an efficient and new type of device structure, ternary OSCs generally consist of multidonor and one acceptor or one donor and multiacceptor. [14,[21][22][23][24][25][26][27] As an efficient and new type of device structure, ternary OSCs generally consist of multidonor and one acceptor or one donor and multiacceptor.…”

Section: Introductionmentioning

confidence: 99%

“…Although the authors mentioned the good miscibility between PTB7-Th and BTR, the impact of miscibility on the corresponding performance of the solar cells was not discussed. [22] Unfortunately, the PCE value of ternary system is much lower than the binary system. [36,45] Although the miscibility is recognized to be an important factor in determining the performance of cells, no detailed quantitative description of miscibility is presented.…”

Section: Introductionmentioning

confidence: 99%

Miscibility Tuning for Optimizing Phase Separation and Vertical Distribution toward Highly Efficient Organic Solar Cells

et al. 2019

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Blending multidonor or multiacceptor organic materials as ternary devices has been recognized as an efficient and potential method to improve the power conversion efficiency of bulk heterojunction devices or single‐junction components in tandem design. In this work, a highly crystalline molecule, DRCN5T, is involved into a PTB7‐Th:PC 70 BM system to fabricate large‐area organic solar cells (OSCs) whose blend film thickness is up to 270 nm, achieving an impressive performance of 11.1%. The significant improvement of OSCs after adding DRCN5T is due to the formation of an interconnected fibrous network with decreased π–π stacking and enhanced domain purity, in addition to the optimized vertical distribution of PTB7‐Th and PC 70 BM, producing more effective charge separation, transport, and collection. The optimized morphology and performance are actually determined by the miscibility in different components, which can be quantitatively described by the Flory–Huggins interaction parameter of −0.80 and 2.94 in DRCN5T:PTB7‐Th and DRCN5T:PC 70 BM blends, respectively. The findings in this work can potentially guide the selection of an appropriate third additive for high‐performance OSCs for the sake of large‐area printing and roll‐to‐roll fabrication from the view of miscibility.

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Panchromatic Sequentially Cast Ternary Polymer Solar Cells

Cited by 93 publications

References 69 publications

Multiple Cases of Efficient Nonfullerene Ternary Organic Solar Cells Enabled by an Effective Morphology Control Method

Multiple Cases of Efficient Nonfullerene Ternary Organic Solar Cells Enabled by an Effective Morphology Control Method

High‐Performance Pseudoplanar Heterojunction Ternary Organic Solar Cells with Nonfullerene Alloyed Acceptor

Miscibility Tuning for Optimizing Phase Separation and Vertical Distribution toward Highly Efficient Organic Solar Cells

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