Elucidating the Impact of Charge Selective Contact in Halide Perovskite Through Impedance Spectroscopy

The electron and hole selective contact (SC) play a pivotal role in the performance of perovskite solar cells. In order to separate the interfacial phenomenon from bulk, the influence of charge SC was elucidated, by means of impedance spectroscopy. The specific role played by TiO2 and Spiro-OMeTAD as electron and hole SC in perovskite solar cells was investigated at short circuit condition at different temperatures. We have probed MAPbI3 and (FAPbI3)0.85(MAPbBr3)0.15 and elucidated parameters such as charge carrier mobility, recombination resistance, time constant and charge carrier kinetics in perovskite layer and at the interface of perovskite/SC. Charge carrier mobility in mixed perovskite was found to be nearly two order of magnitude higher as compared to MAPbI3. Moreover, the carrier mobility in devices with only electron SC was found to be higher as compared only hole SC. The charge accumulation at TiO2/perovskite/Spiro-OMeTAD interfaces were studied via frequency dependent capacitance, revealing higher charge accumulation at perovskite/Spiro-OMeTAD than at TiO2/perovskite interface. By performing varying temperature frequency dependent capacitance measurements the distribution of density of state within the bandgap of the perovskites, the emission rate of electrons from the trap states and traps activation energy was determined.

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The impact of hot charge carrier mobility on photocurrent losses in polymer-based solar cells

Scientific Reports ◽

10.1038/srep05695 ◽

2014 ◽

Vol 4 (1) ◽

Cited By ~ 41

Author(s):

Bronson Philippa ◽

Martin Stolterfoht ◽

Paul L. Burn ◽

Gytis Juška ◽

Paul Meredith ◽

...

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Charge Carrier Mobility ◽

The Impact

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Perovskite solar cells involving poly(tetraphenylbenzidine)s: investigation of hole carrier mobility, doping effects and photovoltaic properties

RSC Advances ◽

10.1039/c4ra05564k ◽

2014 ◽

Vol 4 (82) ◽

pp. 43550-43559 ◽

Cited By ~ 22

Author(s):

Katharina Neumann ◽

Mukundan Thelakkat

Keyword(s):

Molecular Weight ◽

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Perovskite Solar Cells ◽

Charge Carrier Mobility ◽

Hole Transport ◽

Photovoltaic Properties ◽

Doping Effects

A detailed study on the important properties of poly(tetraphenylbenzidine) as hole transport material in perovskite solar cells such as the influence of the molecular weight, the doping effects on charge carrier mobility and the polarity of the material is presented.

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The Effect of Structural Dimensionality on Carrier Mobility in Lead-Halide Perovskites

10.26434/chemrxiv.8242604 ◽

2019 ◽

Author(s):

Noor Titan Putri Hartono ◽

Shijing Sun ◽

María Gélvez-Rueda ◽

Polly Pierone ◽

Matthew Erodici ◽

...

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Perovskite Solar Cells ◽

Charge Carrier Mobility ◽

Lead Iodide ◽

Optical Pump ◽

Structural Dimensionality ◽

Low Dimensional ◽

Lower Dimensional

Methylammonium lead iodide (MAPI) is a prototypical photo absorber in perovskite solar cells (PSCs), reaching efficiencies above 20%. However, its hygroscopic nature has prompted the quest to find water-resistant alternatives. Recent studies have suggested that mixing MAPI with lower dimensional, bulky-A-site-cation perovskites helps mitigate this environmental instability. On the other hand, low dimensional perovskites suffer from poor device performance, which has been suggested to be due to limited out-of-plane charge carrier mobility resulting from structural dimensionality and large binding energy of the charge carriers. To understand the effects of dimensionality on performance, we systematically mixed MA-based 3D perovskites with larger A-site cation, dimethylammonium, iso-propylammonium, and t-butylammonium lead iodide perovskites. During the shift from MAPI to lower dimensional (LD) PSCs, the efficiency is significantly reduced by 2 orders of magnitude, with short-circuit currents decreasing from above 20 mA/cm2 to less than 1 mA/cm2. In order to explain these decrease in performance, we studied the charge carrier mobilities of these materials using optical-pump/ terahertz-probe, time-resolved microwave photoconductivity, and photoluminescence measurements. The results show that as we add more of the low dimensional perovskites, the mobility decreases by a factor of 20 when it reaches pure LD perovskites. In addition, the photoluminescence decay fitting is slightly slower for the mixed perovskites, suggesting some improvement in the recombination dynamics. These findings indicate that changes in structural dimensionality by mixing A-site cations play an important role in measured charge carrier mobility, and in the performance of perovskite solar cells.

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Enhanced charge carrier mobility and lifetime suppress hysteresis and improve efficiency in planar perovskite solar cells

Energy & Environmental Science ◽

10.1039/c7ee02901b ◽

2018 ◽

Vol 11 (1) ◽

pp. 78-86 ◽

Cited By ~ 145

Author(s):

Silver-Hamill Turren-Cruz ◽

Michael Saliba ◽

Matthew T. Mayer ◽

Hector Juárez-Santiesteban ◽

Xavier Mathew ◽

...

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Perovskite Solar Cells ◽

Charge Carrier Mobility ◽

Yield Efficiency ◽

Improve Efficiency

Planar perovskite solar cells yield efficiency of over 20%.

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Correction to Improved Understanding of the Electronic and Energetic Landscapes of Perovskite Solar Cells: High Local Charge Carrier Mobility, Reduced Recombination, and Extremely Shallow Traps

Journal of the American Chemical Society ◽

10.1021/ja511140k ◽

2014 ◽

Vol 136 (48) ◽

pp. 16948-16948 ◽

Cited By ~ 7

Author(s):

Hikaru Oga ◽

Akinori Saeki ◽

Yuhei Ogomi ◽

Shuzi Hayase ◽

Shu Seki

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Perovskite Solar Cells ◽

Charge Carrier Mobility ◽

Local Charge ◽

Shallow Traps

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Improved Understanding of the Electronic and Energetic Landscapes of Perovskite Solar Cells: High Local Charge Carrier Mobility, Reduced Recombination, and Extremely Shallow Traps

Journal of the American Chemical Society ◽

10.1021/ja506936f ◽

2014 ◽

Vol 136 (39) ◽

pp. 13818-13825 ◽

Cited By ~ 374

Author(s):

Hikaru Oga ◽

Akinori Saeki ◽

Yuhei Ogomi ◽

Shuzi Hayase ◽

Shu Seki

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Perovskite Solar Cells ◽

Charge Carrier Mobility ◽

Local Charge ◽

Shallow Traps

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The Effect of Structural Dimensionality on Carrier Mobility in Lead-Halide Perovskites

10.26434/chemrxiv.8242604.v1 ◽

2019 ◽

Author(s):

Noor Titan Putri Hartono ◽

Shijing Sun ◽

María Gélvez-Rueda ◽

Polly Pierone ◽

Matthew Erodici ◽

...

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Carrier Mobility ◽

Perovskite Solar Cells ◽

Charge Carrier Mobility ◽

Lead Iodide ◽

Optical Pump ◽

Structural Dimensionality ◽

Low Dimensional ◽

Lower Dimensional

Methylammonium lead iodide (MAPI) is a prototypical photo absorber in perovskite solar cells (PSCs), reaching efficiencies above 20%. However, its hygroscopic nature has prompted the quest to find water-resistant alternatives. Recent studies have suggested that mixing MAPI with lower dimensional, bulky-A-site-cation perovskites helps mitigate this environmental instability. On the other hand, low dimensional perovskites suffer from poor device performance, which has been suggested to be due to limited out-of-plane charge carrier mobility resulting from structural dimensionality and large binding energy of the charge carriers. To understand the effects of dimensionality on performance, we systematically mixed MA-based 3D perovskites with larger A-site cation, dimethylammonium, iso-propylammonium, and t-butylammonium lead iodide perovskites. During the shift from MAPI to lower dimensional (LD) PSCs, the efficiency is significantly reduced by 2 orders of magnitude, with short-circuit currents decreasing from above 20 mA/cm2 to less than 1 mA/cm2. In order to explain these decrease in performance, we studied the charge carrier mobilities of these materials using optical-pump/ terahertz-probe, time-resolved microwave photoconductivity, and photoluminescence measurements. The results show that as we add more of the low dimensional perovskites, the mobility decreases by a factor of 20 when it reaches pure LD perovskites. In addition, the photoluminescence decay fitting is slightly slower for the mixed perovskites, suggesting some improvement in the recombination dynamics. These findings indicate that changes in structural dimensionality by mixing A-site cations play an important role in measured charge carrier mobility, and in the performance of perovskite solar cells.

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