Masrur Morshed Nahid

North Carolina State University

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Harald Ade

North Carolina State University

Samuel J. Stuard

North Carolina State University

Iain W. H. Oswald

Colorado State University

James R. Neilson

Colorado State University

Liang Yan

University of North Carolina at Chapel Hill

Christopher R. McNeill

Monash University

Eliot Gann

Material Measurement Laboratory

Andrew M. Moran

University of North Carolina at Chapel Hill

Huamin Hu

Changsha University of Science and Technology

Jinsong Huang

University of North Carolina at Chapel Hill

Cooperative Institutions

North Carolina State University

King Abdullah University of Science and Technology

University of North Carolina at Chapel Hill

Chinese Academy of Sciences

Applied Physical Sciences (United States)

University of Science and Technology of China

Korea Institute of Science and Technology

Imperial College London

Korea University

Kootenay Association for Science & Technology

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Dual Sensitizer and Processing-Aid Behavior of Donor Enables Efficient Ternary Organic Solar Cells

Joule (2019)

Xin Song Nicola Gasparini Masrur Morshed Nahid Sri Harish Kumar Paleti Jin‐Liang Wang

10.1016/j.joule.2019.01.009

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Citations (85)

Long-range exciton diffusion in molecular non-fullerene acceptors

Nature Communications (2020)

Yuliar Firdaus Vincent M. Le Corre Safakath Karuthedath Wenlan Liu Anastasia Markina

Abstract The short exciton diffusion length associated with most classical organic semiconductors used in organic photovoltaics (5-20 nm) imposes severe limits on the maximum size of the donor and acceptor domains within the photoactive layer of the cell. Identifying materials that are able to transport excitons over longer distances can help advancing our understanding and lead to solar cells with higher efficiency. Here, we measure the exciton diffusion length in a wide range of nonfullerene acceptor molecules using two different experimental techniques based on photocurrent and ultrafast spectroscopy measurements. The acceptors exhibit balanced ambipolar charge transport and surprisingly long exciton diffusion lengths in the range of 20 to 47 nm. With the aid of quantum-chemical calculations, we are able to rationalize the exciton dynamics and draw basic chemical design rules, particularly on the importance of the end-group substituent on the crystal packing of nonfullerene acceptors.

Photocurrent

Organic semiconductor

Acceptor

Ambipolar diffusion

Photoactive layer

Biexciton

10.1038/s41467-020-19029-9

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Citations (283)

CCDC 1893384: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Jun Hu Iain W. H. Oswald Samuel J. Stuard Masrur Morshed Nahid Ninhao Zhou

10.5517/ccdc.csd.cc21k6xr

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Citations (1)

Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Advanced Functional Materials (2017)

Masrur Morshed Nahid Rukiya Matsidik Adam Welford Eliot Gann Lars Thomsen

The charge transport and microstructural properties of five different molecular weight (MW) batches of the naphthalenediimide‐thiophene copolymer P(NDI2OD‐T2) are investigated. In particular, the field‐effect transistor (FET) performance and thin‐film microstructure of samples with MW varying from M n = 10 to 41 kDa are studied. Unlike conventional semiconducting polymers such as poly(3‐hexylthiophene) where FET mobility dramatically drops with decreasing molecular weight, the FET mobility of P(NDI2OD‐T2)‐based transistors processed from 1,2‐dichlorobenzene is found to increase with decreasing MW. Using a combination of grazing‐incidence wide‐angle X‐ray scattering, near‐edge X‐ray absorption fine‐structure spectroscopy, atomic force microscopy, and resonant soft X‐ray scattering, the increase in FET mobility with decreasing MW is attributed to the pronounced increase in the orientational correlation length (OCL) with decreasing MW. In particular, the OCL is observed to systematically increase from <100 nm for the highest MW samples to ≈1 µm for the lowest MW samples. The improvement in OCL and hence mobility for low MW samples is attributed to the lack of aggregation of low MW chains in solution promoting backbone ordering, with the pre‐aggregation of chains in 1,2‐dichlorobenzene found to suppress longer‐range liquid crystalline order.

Electron Mobility

10.1002/adfm.201604744

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Citations (69)

A Highly Crystalline Fused‐Ring n‐Type Small Molecule for Non‐Fullerene Acceptor Based Organic Solar Cells and Field‐Effect Transistors

Advanced Functional Materials (2018)

Xin Song Nicola Gasparini Masrur Morshed Nahid Hu Chen Sky Marie Macphee

Abstract N‐type organic small molecules (SMs) are attracting attention in the organic electronics field, due to their easy purification procedures with high yield. However, only a few reports show SMs that perform well in both organic field‐effect transistors (OFETs) and organic solar cells (OSCs). Here, the synthesis and characterization of an n‐type small molecule with an indacenodithieno[3,2‐b]thiophene (IDTT) core unit and linear alkylated side chain (C 16 ) (IDTTIC) are reported. Compared to the state‐of‐the‐art n‐type molecule IDTIC, IDTTIC exhibits smaller optical bandgap and higher absorption coefficient, which is due to the enhanced intramolecular effect. After mixing with the polymer donor PBDB‐T, IDTIC‐based solar cells deliver a power conversion efficiency of only 5.67%. In stark contrast, the OSC performance of IDTTIC improves significantly to 11.2%. It is found that the superior photovoltaic properties of PBDB‐T:IDTTIC blends are mainly due to reduced trap‐assisted recombination and enhanced molecular packing coherence length and higher domain purity when compared to IDTIC. Moreover, a significantly higher electron mobility of 0.50 cm 2 V −1 s −1 for IDTTIC in OFET devices than for IDTIC (0.15 cm 2 V −1 s −1 ) is obtained. These superior performances in OSCs and OFETs demonstrate that SMs with extended π‐conjugation of the backbone possess a great potential for application in organic electronic devices.

Organic field-effect transistor

Acceptor

Organic Electronics

HOMO/LUMO

Electron Mobility

10.1002/adfm.201802895

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Citations (85)

Synthetic control over orientational degeneracy of spacer cations enhances solar cell efficiency in two-dimensional perovskites

Nature Communications (2019)

Jun Hu Iain W. H. Oswald Samuel J. Stuard Masrur Morshed Nahid Ninghao Zhou

Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethylammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of two-dimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.

Degeneracy (biology)

10.1038/s41467-019-08980-x

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Citations (254)

In Quest of Printed Electrodes for Light-emitting Electrochemical Cells: A Comparative Study between Two Silver Inks

Masrur Morshed Nahid

This thesis presents a comparative study between two silver nanoparticle inks that were deposited using a Drop-on-Demand (DoD) inkjet printer, aiming at finding a functional ink that can be used to print electrodes in Light-emitting Electrochemical Cells (LECs). To achieve this, a DoD inkjet printer was installed and an acquaintance with the printer was attained. Among the two inks, one was employed as received while the other was reformulated, and successful deposition of both the inks was observed. During the reformulation process, it was seen that the highly volatile tetrahydrofuran (THF) solvent can be used to improve the ink properties, in contrast to what is recommended. After that, the inks were deposited on UV-ozone treated glass substrates, sintered at an elevated temperature under ambient conditions, and their specific resistances and thicknesses were measured. Finally, the inks were used to print the anode in a structured sandwich-cell LEC. The performance comparison was conducted by observing the emitted light of the LECs. The results indicate that the reformulated ink performs better, probably due to the lower silver concentration that results in flatter surface, which in turn effectively alleviates shorts.

Screen printing

Deposition

Source

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Citations (2)

Sensors: A Highly Sensitive Diketopyrrolopyrrole-Based Ambipolar Transistor for Selective Detection and Discrimination of Xylene Isomers (Adv. Mater. 21/2016)

Advanced Materials (2016)

Bin Wang Tan‐Phat Huynh Weiwei Wu Naseem Hayek Thu Trang

An ambipolar organic field-effect transistor (OFET) based on poly(diketopyrrolopyrrole-terthiophene) (PDPPHD-T3) is shown by P. Sonar, H. Haick, and co-workers on page 4012 to sensitively detect xylene isomers at low to 40 ppm level in multiple sensing features. Combined with pattern-recognition algorithms, a sole ambipolar FET sensor, rather than arrays of sensors, is able to discriminate highly similar xylene structural isomers from each other.

Ambipolar diffusion

Organic field-effect transistor

Terthiophene

10.1002/adma.201670145

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Citations (0)

Morphological–Electrical Property Relation in Cu(In,Ga)(S,Se)₂ Solar Cells: Significance of Crystal Grain Growth and Band Grading by Potassium Treatment

Small (2020)

Joo‐Hyun Kim Min Kyu Kim Abay Gadisa Samuel J. Stuard Masrur Morshed Nahid

Abstract Solution‐processed Cu(In,Ga)(S,Se) 2 (CIGS) has a great potential for the production of large‐area photovoltaic devices at low cost. However, CIGS solar cells processed from solution exhibit relatively lower performance compared to vacuum‐processed devices because of a lack of proper composition distribution, which is mainly instigated by the limited Se uptake during chalcogenization. In this work, a unique potassium treatment method is utilized to improve the selenium uptake judiciously, enhancing grain sizes and forming a wider bandgap minimum region. Careful engineering of the bandgap grading structure also results in an enlarged space charge region, which is favorable for electron–hole separation and efficient charge carrier collection. Besides, this device processing approach has led to a linearly increasing electron diffusion length and carrier lifetime with increasing the grain size of the CIGS film, which is a critical achievement for enhancing photocurrent yield. Overall, 15% of power conversion efficiency is achieved in solar cells processed from environmentally benign solutions. This approach offers critical insights for precise device design and processing rules for solution‐processed CIGS solar cells.

Photocurrent

10.1002/smll.202003865

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Citations (13)

NEXAFS spectroscopy of conjugated polymers

European Polymer Journal (2016)

Masrur Morshed Nahid Eliot Gann Lars Thomsen Christopher R. McNeill

XANES

Organic field-effect transistor

10.1016/j.eurpolymj.2016.01.017

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Citations (75)