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Publications

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Electrode metallization for scaled perovskite/silicon tandem solar cells: Challenges and opportunities
Special issue article Year: 2021 DOI:https://doi.org/10.1002/pip.3499
Authors: Atteq ur Rehman, Emmanuel Van Kerschaver, Erkan Aydin, Waseem Raja, Thomas G. Allen, Stefaan De Wolf

Our perspective on the Electrode Metallization for industrial scale Perovskite/Silicon Tandems is published now in Progress in Photovoltaics. The focus of the study reveals the challenges and opportunities of scaled metallization in terms of grid design to mitigate the power losses, adopting state-of-the-art screen-printed metallization as well as cost-effective alternate metallization routes and their viability for industrial applications.

  • Cost analysis
  • Metal contacts
  • Metallization
  • Photovoltaics
  • Screen-printing
  • Perovskite/silicon tandem
Charge Carrier Recombination at Perovskite/Hole Transport Layer Interfaces Monitored by Time-Resolved Spectroscopy
Letter Year: 2021 DOI:https://doi.org/10.1021/acsenergylett.1c01931
Authors: Jafar I.Khan, Furkan H. Isikgor, Esma Ugur, Waseem Raja, George T. Harrison, Emre Yengel, Thomas D. Anthopoulos, Stefaan De Wolf, Frédéric Laquai
  • Oxides
  • interfaces
  • Layers
  • recombination
  • Perovskites
Chemical Design Rules for Non-Fullerene Acceptors in Organic Solar Cells
Research Article Year: 2021 DOI:https://doi.org/10.1002/aenm.202102363
Authors: Anastasia Markina, Kun-Han Lin, Wenlan Liu, Carl Poelking, Yuliar Firdaus, Diego Rosas Villalva, Jafar I.Khan, Sri H. K. Paleti, George T. Harrison, Julien Gorenflot, Weimin Zhang, Stefaan De Wolf, Iain McCulloch, Thomas D. Anthopoulos, Derya Baran, Frédéric Laquai, Denis Andrienko
  • design rules
  • donor-acceptor interface
  • Non-fullerene acceptors
  • organic solar cells
Toward Stable Monolithic Perovskite/Silicon Tandem Photovoltaics: A Six-Month Outdoor Performance Study in a Hot and Humid Climate
Letter Year: 2021 DOI:https://doi.org/10.1021/acsenergylett.1c01018
Authors: Michele De Bastiani, Emmanuel Van Kerschaver, Quentin Jeangros, Atteq ur Rehman, Erkan Aydin, Furkan H. Isikgor, Alessandro J. Mirabelli, Maxime Babics, Jiang Liu, Shynggys Zhumagali, Esma Ugur, George T. Harrison, Thomas G Allen, Bin Chen, Yi Hou, Semen Shikin, Edward H. Sargent, Christophe Ballif, Michael Salvador, Stefaan De Wolf

Perovskite solar cells are an emerging photovoltaic technology that is gathering huge attention in the solar community for its power conversion efficiency. Recently, the coupling between the perovskite and the silicon technologies in the tandem configuration boosted even further this power conversion efficiency, reaching record values for terrestrial applications. However, several degradation mechanisms in the perovskite are negatively affecting the stability of this technology, questioning if successful commercialization is possible. At KPVLAB we are pioneering the outdoor testing of perovskite/silicon tandem solar cells to investigate, understand, and improve their stability.

 

  • Degradation
  • Anions
  • Layers
  • Solar cells
  • Perovskites
Ligand-bridged charge extraction and enhanced quantum efficiency enable efficient n–i–p perovskite/silicon tandem solar cells
Article Year: 2021 DOI:https://doi.org/10.1039/D1EE01206A
Authors: Erkan Aydin, Jiang Liu, Esma Ugur, Randi Azmi, George T. Harrison, Yi Hou, Bin Chen, Shynggys Zhumagali, Michele De Bastiani, Mingcong Wang, Waseem Raja, Thomas G. Allen, Atteq ur Rehman, Anand S. Subbiah, Maxime Babics, Aslihan Babayigit, Furkan H. Isikgor, Kai Wang, Emmanuel Van Kerschaver, Leonidas Tsetseris, Edward H. Sargent, Frédéric Laquai, Stefaan De Wolf
This study demonstrates 27%-efficient perovskite/silicon tandem solar cells in n–i–p configuration by developing novel electron and hole selective contacts, which combine high broadband transparency with efficient charge extraction. This study took place in the June issue of Energy & Environmental Science.
  • Perovskite/silicon tandem solar cells
  • flipped polarity
  • n-i-p tandems
  • niobium oxide
  • vanadium oxide
  • spiro-TTB
  • textured interfaces
  • champion solar cells
  • C60-SAM
  • Two-dimensional passivation
  • enhanced stability
Linked Nickel Oxide/Perovskite Interface Passivation for High-Performance Textured Monolithic Tandem Solar Cell
Research Article Year: 2021 DOI:https://doi.org/10.1002/aenm.202101662
Authors: Shynggys Zhumagali, Furkan H. Isikgor, Partha Maity, Jun Yin, Esma Ugur, Michele De Bastiani, Anand S. Subbiah, Alessandro J. Mirabelli, Randi Azmi, George T. Harrison, Joel Troughton, Erkan Aydin, Jiang Liu, Thomas Allen, Atteq ur Rehman, Derya Baran, Omar F. Mohammed, Stefaan De Wolf
This study demonstrates double-side passivation of the nickel oxide/perovskite interface by incorporating N719 organometallic dye molecule, which enables 26.2% efficient textured monolithic p-i-n perovskite/silicon solar cells. This study was published in October's issue of Advanced Energy Materials.
  • nickel oxide
  • passivation
  • Perovskites
  • Solar cells
  • Tandems
Electron-Selective ‍Lithium Contacts for Crystalline Silicon Solar Cells
Research Article Year: 2021 DOI:https://doi.org/10.1002/admi.202100015
Authors: Jingxuan Kang, Xinbo Yang, Wenzhu Liu, Jiang Liu, Hang Xu, Thomas Allen, Stefaan De Wolf

This study, which takes place Advanced Materials Interfaces reports metallic lithium contact, applied to crystalline silicon solar cell and proved to be an excellent electron-selective, hole-blocking transport layer with an efficiency of 19%.

  • Crystalline silicon solar cells
  • Electron-selective contact materials
  • Heterostructures
  • Lithium
  • Photovoltaics
3-D Modeling of Ultrathin Solar Cells with Nanostructured Dielectric Passivation: Case Study of Chalcogenide Solar Cells
Research Article Year: 2021 DOI:https://doi.org/10.1002/adts.202100191
Authors: Waseem Raja, Erkan Aydin, Thomas G. Allen, Stefaan De Wolf

Ultrathin solar cells can be a path forward to low-cost photovoltaics due to their reduced material consumption and shorter required deposition times. With excellent surface passivation, such devices may feature higher open-circuit voltages (VOC). However, their short-circuit current density (JSC) may be reduced due to decreased light absorption. This mandates implementation of efficient light-trapping structures. To design efficient ultrathin solar cells that combine surface-passivation and light-trapping features, accurate 3-D modeling is necessary. To this end, we have developed a novel 3-D opto-electrical finite-element model to analyze the performance of ultrathin solar cells. We apply our model to the case of ultrathin (< 500 nm) chalcogenide solar cells (copper indium gallium (di) selenide, CIGSe), rear-passivated with nanostructured Al2O3 to circumvent optical and electrical losses, resulting in an absolute PCE enhancement of 3.9%, compared to cells without passivation structure. 

  • 3-D optical electrical modeling
  • Light-trapping
  • nanostructured passivation
Tin Oxide Electron‐Selective Layers for Efficient, Stable, and Scalable Perovskite Solar Cells
Review Year: 2021 DOI:https://doi.org/10.1002/adma.202005504
Authors: Cesur Altinkaya, Erkan Aydin, Esma Ugur, Furkan H. Isikgor, Anand S. Subbiah, Michele De Bastiani, Jiang Liu, Aslihan Babayigit, Thomas G Allen, Frédéric Laquai, Abdullah Yildiz, Stefaan De Wolf

This review, which took place in Advanced Materials, provides a comprehensive overview of the tin-oxide electron-selective layered for champion perovskite solar cells.

  • Electron-selective layers
  • Low-temperature processing
  • perovskite solar cells
  • Tin oxide
Interplay between temperature and bandgap energies on the outdoor performance of perovskite/silicon tandem solar cells
Article Year: 2020 DOI:https://doi.org/10.1038/s41560-020-00687-4
Authors: Erkan Aydin, Thomas G. Allen, Michaele De Bastiani, Lujia Xu, Jorge Ávila, Michael Salvador, Emmanuel Van Kerschaver, Stefaan De Wolf
This study, which took place in Nature Energy, show that a lower bandgap perovskite than needed at standard test conditions is actually beneficial to perovskite/silicon tandem cells in the field.
  • perovskite silicon tandems
  • Field Performance
  • Outdoor test
  • High-efficiency devices
  • Hybrid tandems
  • Certified tandems
Acene Ring Size Optimization in Fused Lactam Polymers Enabling High n-Type Organic Thermoelectric Performance
Article Year: 2020 DOI:https://doi.org/10.1021/jacs.0c10365
Authors: Hu Chen, Maximilian Moser, Suhao Wang, Cameron Jellett, Karl Thorley, George T. Harrison, Xuechen Jiao, MIngfei Xiao, Balaji Purushothaman, Maryam Alsufyani, Helen Bristow, Stefaan De Wolf, Nicola Gasparini, Andrew Wadsworth, Christopher R. McNeill, Henning  Sirringhaus, Simone Fabiano, Iain McCulloch
  • Hydrocarbons
  • Aromatic compounds
  • Electrical conductivity
  • Conjugated polymers
  • Polymers
Impact of Cesium/Rubidium Incorporation on the Photophysics of Multiple‐Cation Lead Halide Perovskites
Full Paper Year: 2020 DOI:https://doi.org/10.1002/solr.202000072
Authors: Yajun Gao, Kai Wang, Mingcong Wang, Jafar I.Khan, Ahmed Balawi, Wenzhu Liu, Stefaan De Wolf, Frédéric Laquai
This work, published in Solar RRL,  presents a detailed study of the photophysics of multiple‐cation mixed halide lead perovskites and develops a concise picture of the impact of cesium/rubidium incorporation on the photophysics and device performance.
  • carrier cooling
  • carrier dynamics
  • halide perovskites
  • ultrafast spectroscopy
A Highly Conductive Titanium Oxynitride Electron‐Selective Contact for Efficient Photovoltaic Devices
Communication Year: 2020 DOI:https://doi.org/10.1002/adma.202002608
Authors: Xinbo Yang, Yuanbao Lin, Jiang Liu, Wenzhu Liu, Qunyu Bi, Xin Song, Jingxuan Kang, Fuzong Xu, Lujia Xu, Mohamed N. Hedhili, Derya Baran, Xiaohong Zhang, Thomas D. Anthopoulos, Stefaan De Wolf
  • electron‐selective contacts
  • organic solar cells
  • passivating contacts
  • silicon solar cell
  • titanium oxynitride
Eco‐Friendly Spray Deposition of Perovskite Films on Macroscale Textured Surfaces
Communication Year: 2020 DOI:https://doi.org/10.1002/admt.201901009
Authors: Simone Sansoni, Michaele De Bastiani, Erkan Aydin, Esma Ugur, Furkan Halis Isikgor, Areej Alzahrani, Francesco Lamberti, Frédéric Laquai, Moreno Meneghetti, Stefaan De Wolf
This study demonstrates the potential usage of the spray deposited perovskite nanocrystal inks for perovskite/silicon tandem solar cells.
  • eco‐friendly spray deposition
  • spray deposition
  • hybrid perovskites
  • textured interfaces
Lewis-Acid Doping of Triphenylamine-Based Hole Transport Materials Improves the Performance and Stability of Perovskite Solar Cells
Research Article Year: 2020 DOI:https://doi.org/10.1021/acsami.0c03660
Authors: Jiang Liu, Wenzhu Liu, Erkan Aydin, George T. Harrison, Furkan H. Isikgor, Xinbo Yang, Anand S. Subbiah, Stefaan De Wolf
This study, which came out in the recent issue of ACS Applied Materials & Interfaces, successfully demonstrates the Lewis-acid (TPFB) doping of the widely used spiro-OMeTAD hole transport materials for perovskite solar cells to. This dopant replaces the conventional LiTFSI/tBP doping. By doing so, the device stability is increased and processing is simplified.
  • Perovskite
  • triphenylamine
  • Lewis acids
  • doping
  • stability
Dynamics of antisolvent processed hybrid metal halide perovskites studied by in situ photoluminescence and its influence on optoelectronic properties
Article Year: 2020 DOI:https://doi.org/10.1021/acsaem.9b02052
Authors: Tze-Bin Song, Zhenghao Yuan, Finn Babbe, David P. Nenon, Erkan Aydin, Stefaan De Wolf, Carolin M. Sutter-Fella
In collaboration with Carolin M. Sutter-Fella from Lawrence Berkeley National Laboratory
  • halide perovskites
  • solution synthesis
  • antisolvent
  • in situ characterization
  • nucleation
  • recombination
How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells
Full Paper Year: 2020 DOI:https://doi.org/10.1002/solr.202000382
Authors: Esma Ugur, Erkki Alarousu, Jafar I.Khan, Ales Vlk, Erkan Aydin, Michele De Bastiani, Ahmed H. Balawi, Sandra P. Gonzalez Lopez, Martin Ledinský, Stefaan De Wolf, Frédéric Laquai
  • Metal halide perovskites
  • Perovskite photophysics
  • perovskite solar cells
  • photodegradation
High-Performance Perovskite Single-Junction and Textured Perovskite/Silicon Tandem Solar Cells via Slot-Die Coating
Letter Year: 2020 DOI:https://doi.org/10.1021/acsenergylett.0c01297
Authors: Anand S. Subbiah, Furkan H. Isikgor, Calvyn T. Howells, Michaele De Bastiani, Jiang Liu, Erkan Aydin, Francesco Furlan, Thomas G Allen, Fuzong Xu, Shynggys Zhumagali, Sjoerd Hoogland, Edward H. Sargent, Iain McCulloch, Stefaan De Wolf
This study, published in ACS Energy Letters, reports one of the highest PCE for single-junction devices fabricated by lost die coating as well as showing the first example of slot-die coated perovskite/silicon tandems on textured interfaces.
  • slot-die coating
  • perovskite solar cells
  • perovskite silicon tandems
A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices
Article Year: 2020 DOI:DOI: 10.1039/C9EE02202C
Authors: Joel Troughton, Marios Neophytou, Nicola Gasparini, Akmaral Seitkhan, Furkan Halis Isikgor, Xin Song, Yen-Hung Lin, Tong Liu, Hendrik Faber, Emre Yengel, Jan Kosco, Marek F. Oszajca, Benjamin Hartmeier, Michael Rossier, Norman A. Lüchinger, Leonidas Tsetseris, Henry J. Snaith, Stefaan De Wolf, Thomas D. Anthopoulos, Iain McCulloch, Derya Baran
Efficient tandem solar cells with solution-processed perovskite on textured crystalline silicon
Report Year: 2020 DOI:DOI: 10.1126/science.aaz3691
Authors: Yi Hou, Erkan Aydin, Michele De Bastiani, Chuanxiao Xiao, Furkan H. Isikgor, Ding-Jiang Xue, Bin Chen, Hao Chen, Behzad Bahrami, Ashraful H. Chowdhury, Andrew Johnston, Se-Woong Baek, Ziru Huang, Mingyang Wei, Yitong Dong, Joel Troughton, Rawan Jalmood, Alessandro J. Mirabelli, Thomas G. Allen, Emmanuel Van Kerschaver, Makhsud I. Saidaminov, Derya Baran, Qiquan Qiao, Kai Zhu, Stefaan De Wolf, Edward H. Sargent
Growing perovskite on textured silicon - this report published in Science demonstrates the solution-processed perovskites on textured c-Si bottom cells in tandem configuration. Textured interfaces enable improved light coupling and efficient charge extraction and result in 25.7% certified monolithic tandem solar cells.
  • Perovskite
  • silicon solar cell
  • Perovskite/silicon tandem solar cells
  • textured interfaces
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