Controlling crystal growth by chloride-assisted synthesis: Towards optimized charge transport in hybrid halide perovskites

Grill, Irene; Handloser, Kathrin; Hanusch, Fabian C.; Giesbrecht, Nadja; Bein, Thomas; Docampo, Pablo; Handloser, Matthias; Hartschuh, Achim

doi:10.1016/j.solmat.2016.11.021

Cited by 8 publications

(7 citation statements)

References 45 publications

(60 reference statements)

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“…Grain boundaries have been reported to include a high density of defect sites, leading to charge recombination and reduced photocurrent. [20,21] SEM top-view images of the perovskite films show comparable crystal morphologies and grain sizes of 200-500 nm for FAMA, Cs5, Rb5 and Rb5Cs5 ( Figure S10).…”

Section: Macroscopic Charge Carrier Transport (Time-of-flight Measurementioning

confidence: 95%

“…To probe the impact of the Cs and Rb addition on charge carrier transport in the perovskite absorber, we performed Time-of-Flight (ToF) measurements on laterally contacted perovskite layers. [20] Further information about the experimental setup and the procedure of the transient photocurrent measurements is given in the Supporting Information ( Figure S8).…”

Section: Macroscopic Charge Carrier Transport (Time-of-flight Measurementioning

confidence: 99%

“…The resulting photocurrent transients show that the transit time ttr that is required for charge carriers to travel laterally from the excitation spot to the opposite Au contact increases with increasing electrode distances ( Figure S9). A previously reported procedure [20] was employed to extract the transit time from the measured photocurrent transient. The average charge carrier mobility µ in the perovskite films can be approximated by the ToF equation:…”

Section: Macroscopic Charge Carrier Transport (Time-of-flight Measurementioning

confidence: 99%

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Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Hutter

Rieder

et al. 2018

Advanced Energy Materials

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Adding cesium (Cs) and rubidium (Rb) cations to FA0.83MA0.17Pb(I0.83Br0.17)3 hybrid lead halide perovskites results in a remarkable improvement in solar cell performance, but the origin of the enhancement has not been fully understood yet. In this work, Time-of-Flight (ToF), Time-Resolved Microwave Conductivity (TRMC), and Thermally Stimulated Current (TSC) measurements were performed to elucidate the impact of the inorganic cation additives on the trap landscape and charge transport properties within perovskite solar cells. These complementary techniques allow for the assessment of both local features within the perovskite crystals and macroscopic properties of films and full devices. Strikingly, Cs-incorporation was shown to reduce the trap density and charge recombination rates in the perovskite layer. This is consistent with the significant improvements in the open-circuit voltage and fill factor of Cscontaining devices. By comparison, Rb-addition results in an increased charge carrier mobility, which is accompanied by a minor increase in device efficiency and reduced current-voltage hysteresis. By mixing Cs and Rb in quadruple cation (Cs-Rb-FA-MA) perovskites, the advantages of both inorganic cations can be combined. Our study provides valuable insights into the role of these additives in multiple-cation perovskite solar cells, which are essential for the design of highperformance devices.

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Section: Macroscopic Charge Carrier Transport (Time-of-flight Measurementioning

confidence: 95%

Section: Macroscopic Charge Carrier Transport (Time-of-flight Measurementioning

confidence: 99%

Section: Macroscopic Charge Carrier Transport (Time-of-flight Measurementioning

confidence: 99%

See 1 more Smart Citation

Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Hutter

Rieder

et al. 2018

Advanced Energy Materials

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218

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“…Figure 6a shows the steady-state PL spectra. The TRPL curves were analyzed with FluoFit software [43,44] and were fitted with tri-exponentiald ecay.T he corresponding parameters are summarized in Ta ble 1. [26] According to the steady-stateP Ls pectra (Figure 6a), the PL intensity is significantly quenched, which indicates that Cr 2 O 3 ESLs have superior electron extraction and transporting properties.…”

Section: Photoelectrical Propertiesmentioning

confidence: 99%

“…Figure 6b shows the TRPL spectra of perovskite light-absorption layer on Cr 2 O 3 ESLs and blank FTO substrate. The TRPL curves were analyzed with FluoFit software [43,44] and were fitted with tri-exponentiald ecay.T he corresponding parameters are summarized in Ta ble 1. Usually,afast decay process is related to an efficient chargec arriere xtraction between the perovskite layer and the ESL.…”

Section: Photoelectrical Propertiesmentioning

confidence: 99%

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Dong

Jia

et al. 2018

ChemSusChem

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The electron-selective layer (ESL) plays a pivotal role in the performance of perovskite solar cells (PSCs). In this study, amorphous dispersible chromium oxide (Cr O ) nanosheets are synthesized by a facile solvothermal reaction, and a Cr O ESL is prepared by spin-coating Cr O ink on fluorine-doped tin oxide substrates without need for further annealing. By using Cr O as the electron-selective layer and Cs (MA FA ) Pb(I Br ) as the light-absorption layer, a planar hybrid perovskite solar cell is fabricated. The spin-coating speed is optimized, the structure and morphology of samples are observed, the photoelectrical properties of ESLs are characterized, and the photovoltaic behaviors of devices are measured. Results show that the as-prepared Cr O layer has high optical transmittance and superb electron extraction and carrier transport property. The planar hybrid PSC based on the optimized Cr O ESL achieves a power conversion efficiency of 16.23 %, which is comparable to devices based on a conventional high-temperature-calcined TiO ESL. These results demonstrate a low-cost and facile route to highly effective perovskite solar cells.

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Electrical Methods to Elucidate Charge Transport in Hybrid Perovskites Thin Films and Devices

Khan

Almohammedi

Kazim

et al. 2019

The Chemical Record

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The panchromatic light absorption and excellent charge carrier transport properties in organo lead halide perovskites allowed to achieve an unprecedented power conversion efficiency in excess of 25 % for thin film photovoltaics fabrication. To understand the underlying phenomena, various comprehensive set of optical and electrical techniques have been employed to investigate the charge carrier dynamics in such devices. In this perspective, we aim to summarize the electrical transport properties of perovskite thin films by using (i) impedance spectroscopy (IS), (ii) space charge limited current (SCLC), (iii) field‐effect transistors (FETs) and (iv) time‐of‐flight (TOF) methods. We have deliberated various equivalent circuit used to model the perovskite solar cells by means of IS. The SCLC technique provide vital electrical parameters such as mobility, activation energy, traps density and distribution, carrier concentration, density of states, etc. The TOF technique measures mobility as a primary parameter while the FETs configuration provide a valuable insight into the in‐plane charge transport in perovskites thin films. We believe that these notable understanding will provide insights into charge carrier dynamics in perovskite materials and devices.

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Controlling crystal growth by chloride-assisted synthesis: Towards optimized charge transport in hybrid halide perovskites

Cited by 8 publications

References 45 publications

Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Electrical Methods to Elucidate Charge Transport in Hybrid Perovskites Thin Films and Devices

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Controlling crystal growth by chloride-assisted synthesis: Towards optimized charge transport in hybrid halide perovskites

Cited by 8 publications

References 45 publications

Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Annealing‐Free Cr2O3 Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Electrical Methods to Elucidate Charge Transport in Hybrid Perovskites Thin Films and Devices

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Product

Resources

About

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells