scholarly journals Transient Photovoltage in Perovskite Solar Cells: Interaction of Trap-Mediated Recombination and Migration of Multiple Ionic Species

2018 ◽  
Vol 122 (21) ◽  
pp. 11270-11281 ◽  
Author(s):  
Daniel Walter ◽  
Andreas Fell ◽  
Yiliang Wu ◽  
The Duong ◽  
Chog Barugkin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Ionic Species ◽  
Transient Photovoltage ◽  
And Migration

scholarly journals Improving Electron Extraction Ability and Device Stability of Perovskite Solar Cells Using a Compatible PCBM/AZO Electron Transporting Bilayer

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 720 ◽  
Author(s):  
Hang Dong ◽  
Shangzheng Pang ◽  
Yi Zhang ◽  
Dazheng Chen ◽  
Weidong Zhu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Metal Electrode ◽  
Extraction Ability ◽  
Time Resolved ◽  
Recombination Lifetime ◽  
Transient Photovoltage ◽  
Device Stability ◽  
Hole Transporting ◽  
Electron Extraction

Due to the low temperature fabrication process and reduced hysteresis effect, inverted p-i-n structured perovskite solar cells (PSCs) with the PEDOT:PSS as the hole transporting layer and PCBM as the electron transporting layer have attracted considerable attention. However, the energy barrier at the interface between the PCBM layer and the metal electrode, which is due to an energy level mismatch, limits the electron extraction ability. In this work, an inorganic aluminum-doped zinc oxide (AZO) interlayer is inserted between the PCBM layer and the metal electrode so that electrons can be collected efficiently by the electrode. It is shown that with the help of the PCBM/AZO bilayer, the power conversion efficiency of PSCs is significantly improved, with negligible hysteresis and improved device stability. The UPS measurement shows that the AZO interlayer can effectively decrease the energy offset between PCBM and the metal electrode. The steady state photoluminescence, time-resolved photoluminescence, transient photocurrent, and transient photovoltage measurements show that the PSCs with the AZO interlayer have a longer radiative carrier recombination lifetime and more efficient charge extraction efficiency. Moreover, the introduction of the AZO interlayer could protect the underlying perovskite, and thus, greatly improve device stability.

Origin of Degradation in Perovskite Solar Cells by Intensity Modulated Photovoltage Spectroscopy Measurement (IMVS)

2021 ◽  
Vol 1028 ◽  
pp. 133-137
Author(s):  
Adhita Asma Nurunnizar ◽  
Alvin Fariz ◽  
Herman ◽  
Rahmat Hidayat
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Conversion Efficiency ◽  
Cell Structure ◽  
Perovskite Solar Cells ◽  
Nyquist Plot ◽  
Frequency Range ◽  
Intensity Modulated ◽  
Transient Photovoltage ◽  
Lower Frequency Range

Perovskite solar cells (PSCs) based on lead halide perovskite have attracted much attention owing to the fast development of their power conversion efficiency (PCE) from 3.8% to 25%. Various factors play important roles in affecting the conversion efficiency of PSCs, such as charge carrier generation, transport, recombination, and collection. In addition, the presence of interfacial defects has also a crucial effect in charge carrier transfer and recombination processes. However, the origin and mechanism of interfacial charge recombinations in PSCs are still not comprehensively investigated. For that purpose, we have performed intensity-modulated photovoltage spectroscopy (IMVS) and transient photovoltage (TPV) measurements of PSCs, which were fabricated with FTO/c-TiO2/mp-TiO2/Perovskite/PTAA/Au cell structure. The solar cell (J-V) characteristics of the PSCs on the day-1, day-2, day-3, and day-6 after the cell fabrication, indicating a significant degradation of the cell with time. The Nyquist plots of IMVS measurement on the same day as the J-V measurement seem to be composed of two semicircles at a lower frequency range and a higher frequency range. The semicircle at the lower frequency range enlarged on the day-6 measurement, but the semicircle at higher frequency decreased. The change of this Nyquist plot is in agreement with a significant decrease in the J-V curves. The semicircle at lower frequency may be assigned to the ion diffusion or migration. Therefore, cell degradation may be caused by the liberation of ions (including iodide) from the surface of the perovskite crystal structure. It then increases recombination loss due to back charge transfer from TiO2 to perovskite as indicated by the changing of the semicircle at high frequency into a smaller semicircle. Therefore, the present results reemphasize that the improvement of PSC stability needs the prevention of ions liberations from the surface by introducing passivation substances. In addition, the results also show the practical usefulness of IMVS for inspecting PSC degradation due to such an ion liberation process.

Interfacial recombination kinetics in aged perovskite solar cells measured using transient photovoltage techniques

Nanoscale ◽  
2019 ◽  
Vol 11 (42) ◽  
pp. 20024-20029 ◽  
Author(s):  
Jesús Jiménez-López ◽  
Emilio Palomares
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Charge Recombination ◽  
Transient Photovoltage ◽  
Interfacial Recombination ◽  
Recombination Kinetics ◽  
Interfacial Charge

The reduction of interfacial charge recombination kinetics in perovskite solar cells is key to increase device photovoltaic efficiencies.

scholarly journals Unravelling steady-state bulk recombination dynamics in thick efficient vacuum-deposited perovskite solar cells by transient methods

2019 ◽  
Vol 7 (24) ◽  
pp. 14712-14722 ◽  
Author(s):  
David Kiermasch ◽  
Lidón Gil-Escrig ◽  
Andreas Baumann ◽  
Henk J. Bolink ◽  
Vladimir Dyakonov ◽  
...  
Keyword(s):  
Solar Cells ◽  
Steady State ◽  
Perovskite Solar Cells ◽  
Second Order ◽  
Operational Conditions ◽  
Transient Photovoltage ◽  
Transient Methods ◽  
Charge Extraction ◽  
First Time ◽  
Recombination Dynamics

By evaluating perovskite solar cells up to 820 nm thick using charge extraction and transient photovoltage, first and second order recombination dynamics can for the first time be identified under operational conditions in complete devices.

scholarly journals Grain Size Influences Activation Energy and Migration Pathways in MAPbBr3 Perovskite Solar Cells

2021 ◽  
pp. 2423-2428
Author(s):  
Lucie McGovern ◽  
Isabel Koschany ◽  
Gianluca Grimaldi ◽  
Loreta A. Muscarella ◽  
Bruno Ehrler
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Solar Cells ◽  
Perovskite Solar Cells ◽  
And Migration ◽  
Migration Pathways

scholarly journals Transient Photovoltage Measurements on Perovskite Solar Cells with Varied Defect Concentrations and Inhomogeneous Recombination Rates

Small Methods ◽  
2020 ◽  
Vol 4 (9) ◽  
pp. 2000290 ◽  
Author(s):  
Zi Shuai Wang ◽  
Firouzeh Ebadi ◽  
Brian Carlsen ◽  
Wallace C. H. Choy ◽  
Wolfgang Tress
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Recombination Rates ◽  
Transient Photovoltage

scholarly journals Revealing the charge carrier kinetics in perovskite solar cells affected by mesoscopic structures and defect states from simple transient photovoltage measurements

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Rahmat Hidayat ◽  
Adhita Asma Nurunnizar ◽  
Alvin Fariz ◽  
Herman ◽  
Erlyta Septa Rosa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Short Interval ◽  
Perovskite Solar Cells ◽  
Crystal Defects ◽  
Transport Layer ◽  
Time Range ◽  
Trap States ◽  
Defect States ◽  
Perovskite Layer ◽  
Transient Photovoltage

Abstract This report shows that, by using simple transient photovoltage (TPV) measurements, we can reveal a significant correlation between the TPV decay characteristics and the performance of these perovskite solar cells. TPV decay seems to be composed of a rising part in a short interval after photoexcitation and a long decaying part that extends up to tens of milliseconds. These decay behaviors look different depending on the mesoscopic structures and the perovskite morphology formed therein, as seen from their Scanning Electron Microcopy images and X-ray diffraction patterns. The decay part can be fitted with a three-exponential decay, which reflects different kinetics of electrons in the perovskite/TiO2 layer. On the other hand, the rising part must be fit by a decay equation derived by employing the convolution theorem, where the rising part can be assigned to the electron transport process inside the perovskite layer and the decaying part can be assigned to electron back-transfer. The characteristics can be then understood by considering the effect of crystal defects and trap states in the perovskite grains and perovskite interface with its transport layer, which is TiO2 in this study. Although the TPV decay occurs in a time range much longer than the primary process of photoexcitation as commonly observed in transient photoluminescence spectroscopy, the processes involved in this TPV strongly correlates with the performance of these perovskite solar cells.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

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