Universality in the intensity-modulated photocurrent in bulk-heterojunction polymer solar cells

Bag, Monojit; Narayan, K. S.

doi:10.1103/physrevb.82.075308

Cited by 23 publications

(36 citation statements)

References 29 publications

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“…[46][47][48] Figure 4a shows the intensitymodulated photovoltage spectroscopy (IMVS) results. [46][47][48] Figure 4a shows the intensitymodulated photovoltage spectroscopy (IMVS) results.…”

Section: Resultsmentioning

confidence: 99%

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Improved Processability and Efficiency of Colloidal Quantum Dot Solar Cells Based on Organic Hole Transport Layers

Aqoma

Mubarok

Lee

et al. 2018

Advanced Energy Materials

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IntroductionColloidal quantum dot (CQD) based photovoltaic devices (CQDPVs) have emerged as promising next-generation solar cells owing to low-cost solution processibility at low temperature, easy bandgap tunability into the near infrared (NIR, λ > 800 nm) regime, and multiple exciton generation. [1,2] The power conversion efficiency (PCE) of CQDPVs has improved High-efficiency solid-state-ligand-exchange (SSE) step-free colloidal quantum dot photovoltaic (CQDPV) devices are developed by employing CQD ink based active layers and organic (Polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7) and poly(3-hexylthiophene) (P3HT)) based hole transport layers (HTLs). The device using PTB7 as an HTL exhibits superior performance to that using the current leading organic HTL, P3HT, because of favorable energy levels, higher hole mobility, and facilitated interfacial charge transfer. The PTB7 based device achieves power conversion efficiency (PCE) of 9.60%, which is the highest among reported CQDPVs using organic HTLs. This result is also comparable to the PCE of an optimized device based on a thiol-exchanged p-type CQD, the current-state-of-the-art HTL. From the viewpoint of device processing, the fabrication of CQDPVs is achieved by direct single-coating of CQD active layers and organic HTLs at low temperature without SSE steps. The experimental results and device simulation results in this work suggest that further engineering of organic HTL materials can open new doors to improve the performance and processing of CQDPVs.

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“…[46][47][48] Figure 4a shows the intensitymodulated photovoltage spectroscopy (IMVS) results. [46][47][48] Figure 4a shows the intensitymodulated photovoltage spectroscopy (IMVS) results.…”

Section: Resultsmentioning

confidence: 99%

“…The dynamics of charge transport/recombination characteristics at the i‐CQD/HTL interfaces were further investigated by impedance spectroscopy . Figure 4 a shows the intensity‐modulated photovoltage spectroscopy (IMVS) results.…”

Section: Resultsmentioning

confidence: 99%

Improved Processability and Efficiency of Colloidal Quantum Dot Solar Cells Based on Organic Hole Transport Layers

Aqoma

Mubarok

Lee

et al. 2018

Advanced Energy Materials

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“…[38][39][40][41][42][43][44] At the same time, we are aware of only one paper that describes an IMPS study of a bulk heterojunction organic solar cell, 45 which appeared when this manuscript was in preparation. However, the interpretation of the IMPS measurements in this paper was somewhat deficient.…”

Section: Introductionmentioning

confidence: 98%

Mechanism of Recombination Losses in Bulk Heterojunction P3HT:PCBM Solar Cells Studied Using Intensity Modulated Photocurrent Spectroscopy

Byers

Ballantyne²,

Rodionov³

et al. 2011

ACS Appl. Mater. Interfaces

108

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Intensity modulated photocurrent (IMPS) and photovoltage (IMVS) spectroscopies were used to study the mechanism of photoprocesses in P3HT:PCBM bulk heterojunction organic solar cells at various light intensities. The use of the frequency domain techniques allowed us to separate the bulk and interfacial processes and gain a valuable insight into the mechanism of losses in these devices. The results provide direct evidence that interfacial nongeminate recombination is one of the dominant loss and aging mechanisms in bulk heterojunction organic solar cells. The trapping of photoexcited holes in the P3HT phase was found to contribute to the increased recombination rate. The results suggest that promising ways of improving the efficiency of bulk heterojunction solar cells may be reducing the charge trapping both at and near the P3HT:PCBM interface, as well as improving the efficiency of charge extraction at contacts.

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“…1) 29 . The MPC technique was originally developed in 1950’s as a method to study localized-state distributions in amorphous inorganic 30–35 and organic 36 semiconductors, and has been recently applied to BHJ OSCs to investigate charge transport processes such as interface recombination and charge lifetime 37–42 . As shown below, the MPC technique can also measure the time period from the photocarrier generation to their arrival to either electrode.…”

Section: Introductionmentioning

confidence: 99%

Modulated Photocurrent Spectroscopy for Determination of Electron and Hole Mobilities in Working Organic Solar Cells

Nojima

Kobayashi

Nagase

et al. 2019

Sci Rep

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Carrier drift mobility is an important physical constant in the charge transport process of organic solar cells (OSCs). Although time-of-flight and space-charge-limited current techniques have been frequently utilized for mobility measurements, the validity of a new method using modulation photocurrent spectroscopy is discussed in this contribution. The advantages of this method are its applicability to working OSCs with optimized device structures and the simultaneous determination of the electron and hole mobilities. These features make it possible to study the relation between the mobility balance and the solar cell characteristics, such as the power conversion efficiency, using only a single working OSC; hence, it is not necessary to fabricate electron-only and hole-only devices for mobility measurements. After carrying out numerical simulations to examine the validity of this method for mobility determination, the dependence of the mobility balance on the mixing ratio of the electron-donor and –acceptor materials is presented.

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Universality in the intensity-modulated photocurrent in bulk-heterojunction polymer solar cells

Cited by 23 publications

References 29 publications

Improved Processability and Efficiency of Colloidal Quantum Dot Solar Cells Based on Organic Hole Transport Layers

Improved Processability and Efficiency of Colloidal Quantum Dot Solar Cells Based on Organic Hole Transport Layers

Mechanism of Recombination Losses in Bulk Heterojunction P3HT:PCBM Solar Cells Studied Using Intensity Modulated Photocurrent Spectroscopy

Modulated Photocurrent Spectroscopy for Determination of Electron and Hole Mobilities in Working Organic Solar Cells

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