Alkali Chlorides for the Suppression of the Interfacial Recombination in Inverted Planar Perovskite Solar Cells

Chen, Wei; Zhou, Yecheng; Chen, Guocong; Wu, Yinghui; Tu, Bao; Liu, Fang‐Zhou; Huang, Li; Ng, Alan Man Ching; Djurišić, Aleksandra B.; He, Zhubing

doi:10.1002/aenm.201803872

Cited by 263 publications

(268 citation statements)

References 56 publications

(101 reference statements)

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“…Figure 4c displays the steady-state PL spectra of PbS-PbX 2 and PbS-AI QD solid film. [50,51] A slower PL decay was observed for PbS-AI QD solid film compared with that of PbS-PbX 2 QD solid film. The timeresolved PL decay measurement was performed using a timecorrelated single-photon counting (TCSPC) technique, which could directly detect the dynamic of photoinduced charge carrier in CQD solid.…”

Section: Charge Recombination and Collectionmentioning

confidence: 95%

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Jia

Chen

Zheng

et al. 2019

Advanced Energy Materials

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absorption spectrum, low-cost, solutionprocessable fabrication, and compatibility with flexible substrates. [8][9][10][11] Furthermore, the surface ligand exchange of postsynthetic QDs allows for tailoring QD surface chemistry, which provides large freedom to fine-tune the optoelectronic properties of QDs, therefore engineering the device performance. [12][13][14] For the QDs in solar cell applications, the multiple excitation generation in QDs gives the possibility to overcome the Shockley-Queisser theoretical limitation on the power conversion efficiency (PCE) of a single-junction solar cell since the QD may produce more than one electron-hole pair after absorbed one high-energy photon. [15,16] Over the past few years, benefiting from the fundamental studies in controlling QD surface chemistry, device architecture, interfacial properties and electro-optics within the QD solar cell (QDSC) devices, significant progress was obtained and a PCE of more than 12% was achieved for the PbS QDSC. [14,17] Meanwhile, the QDSC has good stability both under continuous illumination and long-term storage under ambient conditions, showing great potential for the development of highly efficient and stable photovoltaic devices. [18,19] During the QD synthesis, the long native organic ligand (such as oleic acid (OA)) is generally applied to cover the QD surface to control the dot size and make the colloidal system stable in organic solvents. [20,21] However, when the QDs is used to construct a solar cell, such long organic ligands should be replaced by small surface binding species to decrease the distance between dots and meanwhile minimize QD surface traps, facilitating charge-transport within the QD solid. Insufficient ligand exchange will lead to oxidation on the QD surface, which affects the photovoltaic performance and stability of QDSCs. [22][23][24] Liquid-state ligand exchange approach provides an efficient way to replace the long organic ligand on the QD surface with small binding species, such as small organic molecules or lead halide (PbX 2 , X = Br or I). [2,25,26] The ligand-exchanged QDs are dispersed in a polar butylamine solvent forming a concentrated QD ink, which can be used for the deposition of a thick QD solid film with a single-step deposition technique, significantly decreasing the time for QD solid film deposition and improving material usage efficiency. [17,25] The QD solid film prepared with the QD ink shows better characteristics compared with that Liquid-state ligand exchange provides an efficient approach to passivate a quantum dot (QD) surface with small binding species and achieve a QD ink toward scalable QD solar cell (QDSC) production. Herein, experimental studies and theoretical simulations are combined to establish the physical principles of QD surface properties induced charge carrier recombination and collection in QDSCs. Ammonium iodide (AI) is used to thoroughly replace the native oleic acid ligand on the PbS QD surface forming a concentrated QD ink, which has high stability of more than 30 ...

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Section: Charge Recombination and Collectionmentioning

confidence: 95%

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Jia

Chen

Zheng

et al. 2019

Advanced Energy Materials

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“…Besides, doping effect of alkali chloride treatment for NiO X films has been ruled out via C‐AFM measurements. It showed a small increase of photocurrent for KCl‐modified NiO X films . In addition, the electrical conductivity of CuI/CuSCN composite films was revealed according to the current–voltage curves obtained from the C‐AFM .…”

Section: Applications Of C‐afm Techniquementioning

confidence: 99%

Emerging Conductive Atomic Force Microscopy for Metal Halide Perovskite Materials and Solar Cells

Zhang

et al. 2020

Advanced Energy Materials

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Metal halide perovskite materials, benefiting from a combination of outstanding optoelectronic properties and low‐cost solution‐preparation processes, show tremendous potential for optoelectronics and photovoltaics. However, the nanoscale inhomogeneities of the electronic properties of perovskite materials cause a number of difficulties, such as recombination, stability, and hysteresis, all of which seriously restrict device performance. Scanning probe microscopy, as a high‐resolution imaging technique, has been widely used to connect local properties and micro‐area morphologies to overall device performance. Conductive atomic force microscopy (C‐AFM) can realize a real‐space visualization of topography coupled with optoelectronic properties on a microscopic scale and thereby is uniquely suited to probe the local effects of perovskite materials and devices. The fundamental principles, alternative operation modes, and development of C‐AFM are comprehensively reviewed, and applications in perovskite solar cells (PSCs) for electronic transport behavior, ion migration and hysteresis, ferroelectric polarization, and facet orientation investigation are discussed. A comprehensive understanding and summary of up‐to‐date applications in PSCs is beneficial to further fully exploit the potential of such an emerging technique, so as to provide a novel and effective approach for perovskite materials analysis.

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“…There are several kinds of device architectures (conventional mesoporous, conventional planar, inverted planar, HTLs‐ or ETLs‐free, etc) for PSCs, and the development of inorganic transport materials is crucial for stable and efficient devices . In recent years, several inorganic p‐type semiconductors, such as CuSCN, CuI, NiO x , and VO x , have been developed as HTLs in the inverted planar PSCs …”

Section: Device Photovoltaic Parameters Of Pscs With Different Niox Hmentioning

confidence: 99%

Deepening the Valance Band Edges of NiO_x Contacts by Alkaline Earth Metal Doping for Efficient Perovskite Photovoltaics with High Open‐Circuit Voltage

Qiao

Lin

et al. 2019

Solar RRL

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Organometallic halide perovskite solar cells (PSCs) are rapidly evolving as the promising photovoltaic technologies with high record efficiency over 24%. The inorganic p‐type semiconductor NiOx is extensively used as important hole transport layers for the realization of stable and hysteresis‐free solar cells due to their good electronic properties, facile fabrication, and excellent chemical endurance. However, the critical issues of NiOx films including poor intrinsic conductivity and mismatched band alignment limit further improvement of the device performance. Herein, it is demonstrated that a versatile alkaline earth metal (Mg, Ca, Sr, and Ba) doping strategy can effectively engineer the electronic properties of NiOx contacts in inverted planar PSCs. Alkaline earth metal doping can deepen valence band maximum and enhance the hole conductivity of NiOx films, which better aligns the energy band in solar cells. The champion device based on Sr‐doped NiOx films attains a power conversion efficiency of 19.49% with a high open‐circuit voltage (VOC) of 1.14 V for NiOx‐based CH3NH3PbI3 devices. The resulted device shows negligible hysteresis and high stability as well. This finding provides a systematic doping strategy to further improve the performance of inverted planar PSCs.

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Alkali Chlorides for the Suppression of the Interfacial Recombination in Inverted Planar Perovskite Solar Cells

Cited by 263 publications

References 56 publications

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Emerging Conductive Atomic Force Microscopy for Metal Halide Perovskite Materials and Solar Cells

Deepening the Valance Band Edges of NiO_x Contacts by Alkaline Earth Metal Doping for Efficient Perovskite Photovoltaics with High Open‐Circuit Voltage

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Alkali Chlorides for the Suppression of the Interfacial Recombination in Inverted Planar Perovskite Solar Cells

Cited by 263 publications

References 56 publications

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Emerging Conductive Atomic Force Microscopy for Metal Halide Perovskite Materials and Solar Cells

Deepening the Valance Band Edges of NiOx Contacts by Alkaline Earth Metal Doping for Efficient Perovskite Photovoltaics with High Open‐Circuit Voltage

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Deepening the Valance Band Edges of NiO_x Contacts by Alkaline Earth Metal Doping for Efficient Perovskite Photovoltaics with High Open‐Circuit Voltage