Imperial College London

DrSaifHaque

Faculty of Natural SciencesDepartment of Chemistry

Reader in Materials Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 1886s.a.haque

 
 
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Location

 

164bChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

122 results found

Aristidou N, Haque S, Eames C, Sanchez-Molina I, Bu X, Kosco J, Saiful Islam M, Haque SAet al., Fast oxygen diffusion and iodide defects mediate oxygen-induced degradation of perovskite solar cells, Nature Communications, ISSN: 2041-1723

Methylammonium lead halide perovskites are attracting intense interest as promising materials for next-generation solar cells, but serious issues related to long-term stability need to be addressed. Specifically, perovskite films based on CH3NH3PbI3 undergo fast oxygen- and light-induced degradation. However, the mechanism of such degradation and its relation to particle size and oxygen transport are poorly understood. Here, we report new mechanistic insights through the combined use of isothermal gravimetric analysis, photoluminescence, secondary ion mass spectrometry and ab initio simulation techniques. We find fast oxygen diffusion into CH3NH3PbI3 films is accompanied by superoxide formation, which are critical to degradation by oxygen in the atmosphere.Perovskite films composed of small crystallites show high yields of photo-induced superoxide species and low stability. Ab initio simulations indicate that iodide vacancies are the preferred sites in mediating the photo-induced formation of superoxide species from oxygen. We also show that thin-film passivation with iodide salts can lead to enhanced film stability and thus device stability. The understanding of degradation phenomena gained from this study is important for the future design and optimisation of perovskite solar cells with greater stability.

JOURNAL ARTICLE

Mokhtar MZ, Chen M, Whittaker E, Hamilton B, Aristidou N, Ramadan S, Gholinia A, Haque SA, O'Brien P, Saunders BRet al., 2017, CH3NH3PbI3 films prepared by combining 1-and 2-step deposition: how crystal growth conditions affect properties, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 19, Pages: 7204-7214, ISSN: 1463-9076

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Bryant D, Aristidou N, Pont S, Sanchez-Molina I, Chotchuangchutchaval T, Wheeler S, Durrant JR, Haque SAet al., 2016, Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells (vol 9, pg 1655, 2016), ENERGY & ENVIRONMENTAL SCIENCE, Vol: 9, Pages: 1850-1850, ISSN: 1754-5692

JOURNAL ARTICLE

Bryant D, Aristidou N, Pont S, Sanchez-Molina I, Chotchunangatchaval T, Wheeler S, Durrant JR, Haque SAet al., 2016, Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 9, Pages: 1655-1660, ISSN: 1754-5692

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Cappel UB, Moia D, Bruno A, Vaissier V, Haque SA, Barnes PRFet al., 2016, Evidence for photo-induced charge separation between dye molecules adsorbed to aluminium oxide surfaces, SCIENTIFIC REPORTS, Vol: 6, ISSN: 2045-2322

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Aristidou N, Sanchez-Molina I, Chotchuangchutchaval T, Brown M, Martinez L, Rath T, Haque SAet al., 2015, The Role of Oxygen in the Degradation of Methylammonium Lead Trihalide Perovskite Photoactive Layers, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 54, Pages: 8208-8212, ISSN: 1433-7851

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Bruno A, Commodo M, Haque SA, Minutolo Pet al., 2015, Spectroscopic investigation of flame synthesized carbon nanoparticle/P3HT blends, CARBON, Vol: 94, Pages: 955-961, ISSN: 0008-6223

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Cao Y, Bernechea M, Maclachlan A, Zardetto V, Creatore M, Haque SA, Konstantatos Get al., 2015, Solution Processed Bismuth Sulfide Nanowire Array Core/Silver Sulfide Shell Solar Cells, CHEMISTRY OF MATERIALS, Vol: 27, Pages: 3700-3706, ISSN: 0897-4756

JOURNAL ARTICLE

Hu Y, Sanchez-Molina I, Haque SA, Robertson Net al., 2015, Ruthenium Dyes with Azo Ligands: Light Harvesting, Excited-State Properties and Relevance to Dye-Sensitised Solar Cells, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Pages: 5864-5873, ISSN: 1434-1948

JOURNAL ARTICLE

Li X, Hu Y, Sanchez-Molina I, Zhou Y, Yu F, Haque SA, Wu W, Hua J, Tian H, Robertson Net al., 2015, Insight into quinoxaline containing D-pi-A dyes for dye-sensitized solar cells with cobalt and iodine based electrolytes: the effect of pi-bridge on the HOMO energy level and photovoltaic performance, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 3, Pages: 21733-21743, ISSN: 2050-7488

JOURNAL ARTICLE

MacLachlan AJ, Rath T, Cappel UB, Dowland SA, Amenitsch H, Knall A-C, Buchmaier C, Trimmel G, Nelson J, Haque SAet al., 2015, Polymer/Nanocrystal Hybrid Solar Cells: Influence of Molecular Precursor Design on Film Nanomorphology, Charge Generation and Device Performance, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 409-420, ISSN: 1616-301X

JOURNAL ARTICLE

O'Mahony FTF, Lee YH, Jellett C, Dmitrov S, Bryant DTJ, Durrant JR, O'Regan BC, Graetzel M, Nazeeruddin MK, Haque SAet al., 2015, Improved environmental stability of organic lead trihalide perovskite-based photoactive-layers in the presence of mesoporous TiO2, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 3, Pages: 7219-7223, ISSN: 2050-7488

JOURNAL ARTICLE

Rath T, Gury L, Sanchez-Molina I, Martinez L, Haque SAet al., 2015, Formation of porous SnS nanoplate networks from solution and their application in hybrid solar cells, CHEMICAL COMMUNICATIONS, Vol: 51, Pages: 10198-10201, ISSN: 1359-7345

JOURNAL ARTICLE

Rath T, MacLachlan AJ, Brown MD, Hague SAet al., 2015, Structural, optical and charge generation properties of chalcostibite and tetrahedrite copper antimony sulfide thin films prepared from metal xanthates, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 3, Pages: 24155-24162, ISSN: 2050-7488

JOURNAL ARTICLE

Bruno A, Borriello C, Haque SA, Minarini C, Di Luccio Tet al., 2014, Ternary hybrid systems of P3HT-CdSe-WS2 nanotubes for photovoltaic applications, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 16, Pages: 17998-18003, ISSN: 1463-9076

JOURNAL ARTICLE

Guilbert AAY, Schmidt M, Bruno A, Yao J, King S, Tuladhar SM, Kirchartz T, Alonso MI, Goni AR, Stingelin N, Haque SA, Campoy-Quiles M, Nelson Jet al., 2014, Spectroscopic Evaluation of Mixing and Crystallinity of Fullerenes in Bulk Heterojunctions, ADVANCED FUNCTIONAL MATERIALS, Vol: 24, Pages: 6972-6980, ISSN: 1616-301X

JOURNAL ARTICLE

Lindblad R, Cappel UB, O'Mahony FTF, Siegbahn H, Johansson EMJ, Haque SA, Rensmo Het al., 2014, Energy level alignment in TiO2/metal sulfide/polymer interfaces for solar cell applications, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 16, Pages: 17099-17107, ISSN: 1463-9076

JOURNAL ARTICLE

MacLachlan AJ, O'Mahony FTF, Sudlow AL, Hill MS, Molloy KC, Nelson J, Haque SAet al., 2014, Solution- Processed Mesoscopic Bi2S3: Polymer Photoactive Layers, CHEMPHYSCHEM, Vol: 15, Pages: 1019-1023, ISSN: 1439-4235

JOURNAL ARTICLE

Martinez L, Higuchi S, MacLachlan AJ, Stavrinadis A, Miller NC, Diedenhofen SL, Bernechea M, Sweetnam S, Nelson J, Haque SA, Tajima K, Konstantatos Get al., 2014, Improved electronic coupling in hybrid organic-inorganic nanocomposites employing thiol-functionalized P3HT and bismuth sulfide nanocrystals, NANOSCALE, Vol: 6, Pages: 10018-10026, ISSN: 2040-3364

JOURNAL ARTICLE

Pearson AJ, Watters DC, Yi H, Sarjadi MS, Reynolds LX, Marchisio PP, Kingsley J, Haque SA, Iraqi A, Lidzey DGet al., 2014, Impact of dithienyl or thienothiophene units on the optoelectronic and photovoltaic properties of benzo[1,2,5]thiadiazole based donor-acceptor copolymers for organic solar cell devices, RSC ADVANCES, Vol: 4, Pages: 43142-43149, ISSN: 2046-2069

JOURNAL ARTICLE

Piper RB, Yoshida M, Farrell DJ, Khoury T, Crossley MJ, Schmidt TW, Haque SA, Ekins-Daukes NJet al., 2014, Kinetic insight into bimolecular upconversion: experiment and simulation, RSC ADVANCES, Vol: 4, Pages: 8059-8063, ISSN: 2046-2069

JOURNAL ARTICLE

Wood S, Garnett O, Tokmoldin N, Tsoi WC, Haque SA, Kim J-Set al., 2014, In situ formation of organic-inorganic hybrid nanostructures for photovoltaic applications, FARADAY DISCUSSIONS, Vol: 174, Pages: 267-279, ISSN: 1359-6640

JOURNAL ARTICLE

Arar M, Gruber M, Edler M, Haas W, Hofer F, Bansal N, Reynolds LX, Haque SA, Zojer K, Trimmel G, Rath Tet al., 2013, Influence of morphology and polymer: nanoparticle ratio on device performance of hybrid solar cells-an approach in experiment and simulation, NANOTECHNOLOGY, Vol: 24, ISSN: 0957-4484

JOURNAL ARTICLE

Bansal N, O'Mahony FTF, Lutz T, Haque SAet al., 2013, Solution Processed Polymer-Inorganic Semiconductor Solar Cells Employing Sb2S3 as a Light Harvesting and Electron Transporting Material, ADVANCED ENERGY MATERIALS, Vol: 3, Pages: 986-990, ISSN: 1614-6832

JOURNAL ARTICLE

Bansal N, Reynolds LX, MacLachlan A, Lutz T, Ashraf RS, Zhang W, Nielsen CB, McCulloch I, Rebois DG, Kirchartz T, Hill MS, Molloy KC, Nelson J, Haque SAet al., 2013, Influence of Crystallinity and Energetics on Charge Separation in Polymer-Inorganic Nanocomposite Films for Solar Cells, SCIENTIFIC REPORTS, Vol: 3, ISSN: 2045-2322

JOURNAL ARTICLE

Bruno A, Borriello C, Di Luccio T, Nenna G, Sessa L, Concilio S, Haque SA, Minarini Cet al., 2013, White light-emitting nanocomposites based on an oxadiazole-carbazole copolymer (POC) and InP/ZnS quantum dots, JOURNAL OF NANOPARTICLE RESEARCH, Vol: 15, ISSN: 1388-0764

JOURNAL ARTICLE

Bruno A, Del Mauro ADG, Nenna G, Haque SA, Minarini Cet al., 2013, Insights on photophysical proprieties of DCM dye in PVK host matrix, POLYMER COMPOSITES, Vol: 34, Pages: 1500-1505, ISSN: 0272-8397

JOURNAL ARTICLE

Bruno A, Del Mauro ADG, Nenna G, Maglione MG, Haque SA, Minarini Cet al., 2013, Electroluminescence and fluorescence emission of poly(n-vinylcarbazole) and poly(n-vinylcarbazole)-Ir(ppy)(3)-based organic light-emitting devices prepared with different solvents, JOURNAL OF PHOTONICS FOR ENERGY, Vol: 3, ISSN: 1947-7988

JOURNAL ARTICLE

Bruno A, Reynolds LX, Dyer-Snaith C, Nelson J, Haque SAet al., 2013, Determining the Exciton Diffusion Length in a Polyfluorene from Ultrafast Fluorescence Measurements of Polymer/Fullerene Blend Films, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 117, Pages: 19832-19838, ISSN: 1932-7447

JOURNAL ARTICLE

Cappel UB, Dowland SA, Reynolds LX, Dimitrov S, Haque SAet al., 2013, Charge Generation Dynamics in CdS:P3HT Blends for Hybrid Solar Cells, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 4, Pages: 4253-4257, ISSN: 1948-7185

JOURNAL ARTICLE

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