Publications by Dongqin Bi | EPFL Graph Search

Perovskitoid-Templated Formation of a 1D@3D Perovskite Structure toward Highly Efficient and Stable Perovskite Solar Cells

Ulf Anders Hagfeldt, Dongqin Bi, Haibing Xie

Longevity is a long-standing concern for organic-inorganic hybrid perovskite solar cells (PSCs). Recently, the use of low dimensional perovskite has been proven to be a promising strategy to improve the stability of PSCs. Herein, it is demonstrated that 1D ...

WILEY-V C H VERLAG GMBH2021

Stable Layered 2D Perovskite Solar Cells with an Efficiency of over 19% via Multifunctional Interfacial Engineering

Ulf Anders Hagfeldt, Dongqin Bi

Layered 2D perovskites have been extensively investigated by scientists with photovoltaics (PV) expertise due to their good environmental stability. However, a random phase distribution in the perovskite film could affect both the performance and stability ...

AMER CHEMICAL SOC2021

Formation of Stable Mixed Guanidinium–Methylammonium Phases with Exceptionally Long Carrier Lifetimes for High-Efficiency Lead Iodide-Based Perovskite Photovoltaics

Shaik Mohammed Zakeeruddin, Norman Pellet, Dominik Józef Kubicki, David Lyndon Emsley, Dongqin Bi, Albert Hofstetter, Pankaj Kumar Yadav, Daniel Prochowicz

Methylammonium (MA)- and formamidinium (FA)-based organic-inorganic lead halide perovskites provide outstanding performance as photovoltaic materials, due to their versatility of fabrication and their power conversion efficiencies reaching over 22%. The pr ...

2018

Adamantanes Enhance the Photovoltaic Performance and Operational Stability of Perovskite Solar Cells by Effective Mitigation of Interfacial Defect States

Shaik Mohammed Zakeeruddin, Dongqin Bi, Linfeng Pan, Mohammad Mahdi Tavakoli

2018

Suppressing defects through the synergistic effect of a Lewis base and a Lewis acid for highly efficient and stable perovskite solar cells

Shaik Mohammed Zakeeruddin, Norman Pellet, Dongqin Bi, Fei Zhang, Kai Zhu

2018

Multifunctional molecular modulators for perovskite solar cells with over 20% efficiency and high operational stability

Shaik Mohammed Zakeeruddin, Pierre Mettraux, Norman Pellet, Dominik Józef Kubicki, Xiong Li, Jingshan Luo, David Lyndon Emsley, Dongqin Bi, Jovana Milic

Perovskite solar cells present one of the most prominent photovoltaic technologies, yet their stability, scalability, and engineering at the molecular level remain challenging. We demonstrate a concept of multifunctional molecular modulation of scalable an ...

Nature Research2018

Dopant-free star-shaped hole-transport materials for efficient and stable perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Chenyi Yi, Xiong Li, Dongqin Bi, Fei Zhang, Shilong Wang

Two star-shaped TPA-based small-molecule materials (Z1012 and Z1013) were designed and synthesized in this paper. These molecules show high hole mobility and suitable energy levels for CH3NH3PbI3-based perovskite solar cells. Photovoltaic cells based on th ...

Elsevier2017

Over 20% PCE perovskite solar cells with superior stability achieved by novel and low-cost hole-transporting materials

Michael Graetzel, Shaik Mohammed Zakeeruddin, Norman Pellet, Chenyi Yi, Xiong Li, Jingshan Luo, Dongqin Bi, Fei Zhang, Hongwei Zhu, Shilong Wang, Ziyun Wang

The exploration of alternative low-cost molecular hole-transporting materials (HTMs) for both highly efficient and stable perovskite solar cells (PSCs) is a relatively new research area. Two novel HTMs using the thiophene core were designed and synthesized ...

Elsevier Science Bv2017

Isomer-Pure Bis-PCBM-Assisted Crystal Engineering of Perovskite Solar Cells Showing Excellent Efficiency and Stability

Michael Graetzel, Shaik Mohammed Zakeeruddin, Norman Pellet, Chenyi Yi, Xiong Li, Jingshan Luo, Dongqin Bi, Fei Zhang, Shilong Wang

A fullerene derivative (alpha-bis-PCBM) is purified from an as-produced bis-phenyl-C-61-butyric acid methyl ester (bis-[60]PCBM) isomer mixture by preparative peak-recycling, high-performance liquid chromatography, and is employed as a templating agent for ...

Wiley-Blackwell2017

Morphology Engineering: A Route to Highly Reproducible and High Efficiency Perovskite Solar Cells

Michael Graetzel, Arnaud Magrez, Ulf Anders Hagfeldt, Jingshan Luo, Dongqin Bi, Fei Zhang

Despite the rapid increase in the performance of perovskite solar cells (PSC), they still suffer from low lab-to-lab or people-to-people reproducibility. Aiming for a universal condition to high-performance devices, we investigated the morphology evolution ...

Wiley-VCH Verlag Berlin2017

High efficiency large area perovskite solar cells and process for producing the same

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Chenyi Yi, Xiong Li, Dongqin Bi

The present invention relates to a method for producing a solid state solar cell, comprising the steps of providing a conductive support layer or current collector, applying a metal oxide layer on the conducting support layer, applying at least one sensiti ...

2017

High-Efficiency Perovskite Solar Cells Employing a S,N-Heteropentacene-based D-A Hole-Transport Material

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Peng Gao, Amaresh Mishra, Marius Franckevicius, Dongqin Bi

We developed a new donor--acceptor-type hole-transport material (HTMs) incorporating S,N-heteropentacene as -spacer, triarylamine as donor, and dicyanovinylene as acceptor. In addition to appropriate frontier molecular orbital energies, the new HTM showed ...

Wiley-V C H Verlag Gmbh2016

Dopant-Free Donor (D)–p–D–p–D Conjugated Hole- Transport Materials for Efficient and Stable Perovskite Solar Cells

Shaik Mohammed Zakeeruddin, Chenyi Yi, Xiong Li, Jingshan Luo, Dongqin Bi, Fei Zhang, Shilong Wang

Three novel hole-transporting materials (HTMs) using the 4-methoxytriphenylamine (MeOTPA) core were designed and synthesized. The energy levels of the HTMs were tuned to match the perovskite energy levels by introducing symmetrical electron-donating groups ...

2016

Polymer-templated nucleation and crystal growth of perovskite films for solar cells with efficiency greater than 21%

Shaik Mohammed Zakeeruddin, Jean-David Décoppet, Ulf Anders Hagfeldt, Chenyi Yi, Xiong Li, Jingshan Luo, Dongqin Bi, Fei Zhang

The past several years have witnessed the rapid emergence of a class of solar cells based on mixed organic-inorganic halide perovskites. Today's state-of-the-art perovskite solar cells (PSCs) employ various methods to enhance nucleation and improve the smo ...

Nature Publishing Group2016

A novel one-step synthesized and dopant-free hole transport material for efficient and stable perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Chenyi Yi, Xiong Li, Jingshan Luo, Dongqin Bi, Fei Zhang, Shilong Wang

A hole transport material ST1 was synthesized by a one-step Heck reaction. Compared to Spiro-OMeTAD, perovskite solar cells with ST1 exhibit a remarkable overall power conversion efficiency of 15.4% without the use of any dopants and additives, which is co ...

Royal Society of Chemistry2016

Facile synthesized organic hole transporting material for perovskite solar cell with efficiency of 19.8%

Michael Graetzel, Ulf Anders Hagfeldt, Peng Gao, Dongqin Bi

The exploration of alternative molecular hole-transporting materials (HTMs) specifically for high performance perovskite solar cells (PSCs) is a relatively recent research area. Aiming for further increasing the 'efficiency-cost ratio' of PSCs, we develope ...

Elsevier Science Bv2016

Bipolar Membrane-Assisted Solar Water Splitting in Optimal pH

Michael Graetzel, Ulf Anders Hagfeldt, Jingshan Luo, Dongqin Bi

Wiley-V C H Verlag Gmbh2016

High-Performance Perovskite Solar Cells with Enhanced Environmental Stability Based on Amphiphile-Modified CH3NH3PbI3

Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Ulf Anders Hagfeldt, Emad Oveisi, Peng Gao, Jingshan Luo, Dongqin Bi

A new aliphatic fluorinated amphiphilic additive is added to CH3NH3PbI3 perovskite to tune the morphology and enhance the environmental stability without sacrificing the performance of the devices. Judicious screening of the perovskite precursor solution r ...

Wiley-V C H Verlag Gmbh2016

A low-cost spiro[fluorene-9,9 '-xanthene]-based hole transport material for highly efficient solid-state dye-sensitized solar cells and perovskite solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Dongqin Bi, Peng Liu, Ming Cheng

A low-cost spiro[fluorene-9,9'-xanthene] (SFX) based organic hole transport material (HTM) termed X60 was designed and synthesized using a two-step synthetic route. Devices with X60 as HTM showed high power conversion efficiencies (PCEs) amounting to 7.30% ...

Royal Society of Chemistry2016

A vacuum flash-assisted solution process for high-efficiency large-area perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jean-David Décoppet, Ulf Anders Hagfeldt, Chenyi Yi, Xiong Li, Jingshan Luo, Dongqin Bi

Metal halide perovskite solar cells (PSCs) currently attract enormous research interest because of their high solar-to-electric power conversion efficiency (PCE) and low fabrication costs, but their practical development is hampered by difficulties in achi ...

American Association for the Advancement of Science2016