Efficient and carbon-based hole transport layer-free CsPbI<sub>2</sub>Br planar perovskite solar cells using PMMA modification

Zhang, Xiang; Zhou, Yang; Li, Yuzhu; Sun, Jiawen; Lu, Xubing; Gao, Xingsen; Gao, Jinwei; Shui, Lingling; Wu, Sujuan; Liu, Jun‐Ming

doi:10.1039/c9tc00374f

Cited by 104 publications

(92 citation statements)

References 67 publications

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“…A lower value of R s and higher value of R sh are desired to boost the overall performance of the device. Therefore, a larger ratio of R sh / R s results in higher FF . This is also the case for our devices.…”

Section: Resultssupporting

confidence: 69%

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Facile fabrication of low‐cost low‐temperature carbon‐based counter electrode with an outstanding fill factor of 73% for dye‐sensitized solar cells

et al. 2020

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Summary Developing chemically inert, electrically conductive, and catalytically active counter electrodes (CEs) to replace conventional Pt‐based ones is highly desirable for dye‐sensitized solar cells. Herein, we reported a facile, cost‐effective, and low‐temperature synthesis pathway to develop carbon‐based CEs. The performance of homemade carbon paste (H‐CP)–based CE (H‐CE) was compared with that of commercial carbon paste (C‐CP)–based CE (C‐CE) and Pt‐based CE (Pt‐CE). The scanning electron microscope (SEM) results showed that H‐CE demonstrated a penetrable surface structure which facilitates the diffusion of electrolyte through the carbon electrode. This phenomenon enhanced the triiodide reduction with respect to C‐CE having a compact structure that limits the electrolyte diffusion. The charge transfer properties and catalytic activities of the investigated devices were explored using electrochemical impedance spectroscopy and Tafel polarization measurements; the obtained results indicated that the device based on H‐CE revealed relatively lower charge transfer resistance and higher exchange current density compared with C‐CE‐based device. The current‐voltage measurements showed that the device based on H‐CE has a power conversion efficiency of 2.70%, which was about 1.6 times higher than that of the device based on C‐CE (1.68%). Furthermore, a fill factor of 73% was achieved for the device based on H‐CE, which outperformed the Pt‐based device (69%) and was among one of the highest values obtained in the literature. Also, a tape adhesion test performed on H‐CP‐coated glass substrate displayed its excellent robustness.

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Section: Resultssupporting

confidence: 69%

“…Therefore, a larger ratio of R sh /R s results in higher FF. 51,52 This is also the case for our devices. As seen in Table 1, the H-CE-based device has the largest R sh /R s and thus the highest FF value.…”

Section: Photovoltaic Performance Of Dsscssupporting

confidence: 65%

Facile fabrication of low‐cost low‐temperature carbon‐based counter electrode with an outstanding fill factor of 73% for dye‐sensitized solar cells

et al. 2020

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“…Nevertheless, excessive replacement of Pb 2+ by Ba 2+ may result in unstable perovskite structure and lead to inferior photovoltaic properties and poor morphology. To solve this problem, polymer additives, including poly(vinylidene fluoride‐co‐trifluoroethylene) [P(VDF‐TrFE)], polymethyl methacrylate (PMMA), and PEG, were added into the lead‐reduced mixed‐cation perovskite to modify the perovskite films.…”

Section: Introductionmentioning

confidence: 99%

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Chan

et al. 2020

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The organic–inorganic halide perovskite solar cells (PSCs) are rapidly developed in just a few years due to its high power conversion efficiency. However, it still faces some critical issues, one of which is the presence of toxic lead (Pb2+). Recent researches show that barium (Ba2+) can partially replace the Pb2+ in perovskite structure and achieve a promising device performance because of its adequate ionic radius. However, the optimal replacement amount of Ba2+ in perovskite is still limited. Herein, the methylammonium (MA)/formamidinium (FA) mixed‐cation perovskite is used as the active layer in PSCs and Pb2+ is partially substituted with Ba2+. Compared with the pure MA system, the best device efficiency can be achieved using higher Ba2+ replacement ratio. In addition, while introducing the appropriate polymer additive, the replacement ratio can be further increased without compromise of device efficiency. Using polyethylene glycol as polymer additive, 10.0 mol% Ba‐doped MA/FA mixed‐cation PSC with an efficiency of 16.1% can be realized. It is believed that this report provides an effective strategy to fabricate high‐performance lead‐reduced PSCs.

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“…In addition, glass/indium tin oxide (ITO)/SnO 2 /CsPbI 2 Br/carbon‐configured inorganic PSCs have been fabricated using PMMA. [ 44 ] The PMMA‐modified carbon‐based HTL‐free CsPbI 2 Br PSCs demonstrated improved V OC and FF and exhibited a champion efficiency of 10.95% (much higher than that of the reference PSCs, 9.14%) and reduced hysteresis. Moreover, the PMMA‐modified nonencapsulated CsPbI 2 Br PSCs exhibited improved device stability and retained ≈95% of their initial PCE after exposure to air (25–35% RH) for 20 days.…”

Section: Properties and Classification Of Psc Polymeric Additivesmentioning

confidence: 99%

Role and Contribution of Polymeric Additives in Perovskite Solar Cells: Crystal Growth Templates and Grain Boundary Passivators

et al. 2021

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Polymers or polymeric materials are used as additives for promoting the nucleation and crystallization of perovskite films to increase the crystal grain size. Due to their high molecular weight, polymers remain within perovskite‐crystal grain boundaries (GBs), where they passivate trap sites. Furthermore, some polymers function as charge‐transport materials in interfacial layers to effectively separate charge carriers and reduce charge recombination. Certain hydrophobic polymers protect perovskite films against moisture, whereas elastic polymers contribute to the mechanical resilience of perovskite films by crosslinking and self‐healing. Although polymeric additives have become essential to perovskite fabrication, a thorough review has not summarized their application to perovskite solar cells. Therefore, various strategies are comprehensively discussed for incorporating typical polymers and 1D polymeric materials into perovskite materials to improve the efficiency and stability of perovskite devices. Herein, thermoplastic, hydrophilic, and conductive polymers and elastomers are focused and related works are chronologically discussed to clearly elucidate the advances in perovskite devices.

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Efficient and carbon-based hole transport layer-free CsPbI₂Br planar perovskite solar cells using PMMA modification

Abstract: In this work, planar inorganic perovskite solar cells (PSCs) with the simple structure of glass/ITO/SnO2/CsPbI2Br/C have been fabricated.

Cited by 104 publications

References 67 publications

Facile fabrication of low‐cost low‐temperature carbon‐based counter electrode with an outstanding fill factor of 73% for dye‐sensitized solar cells

Facile fabrication of low‐cost low‐temperature carbon‐based counter electrode with an outstanding fill factor of 73% for dye‐sensitized solar cells

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Role and Contribution of Polymeric Additives in Perovskite Solar Cells: Crystal Growth Templates and Grain Boundary Passivators

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Efficient and carbon-based hole transport layer-free CsPbI2Br planar perovskite solar cells using PMMA modification

Abstract: In this work, planar inorganic perovskite solar cells (PSCs) with the simple structure of glass/ITO/SnO2/CsPbI2Br/C have been fabricated.

Cited by 104 publications

References 67 publications

Facile fabrication of low‐cost low‐temperature carbon‐based counter electrode with an outstanding fill factor of 73% for dye‐sensitized solar cells

Facile fabrication of low‐cost low‐temperature carbon‐based counter electrode with an outstanding fill factor of 73% for dye‐sensitized solar cells

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Role and Contribution of Polymeric Additives in Perovskite Solar Cells: Crystal Growth Templates and Grain Boundary Passivators

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Efficient and carbon-based hole transport layer-free CsPbI₂Br planar perovskite solar cells using PMMA modification