Elucidating the evolution of the current-voltage characteristics of planar organometal halide perovskite solar cells to an S-shape at low temperature

Xu, Fei; Zhu, Jingtao; Cao, Runan; Ge, Shenguang; Wang, Wenzhen; Xu, Haitao; Xu, Run; Wu, Yuna; Gao, Ming; Ma, Zhongquan; Hong, Fung‐E; Jiang, Zuimin

doi:10.1016/j.solmat.2016.08.011

Cited by 23 publications

(29 citation statements)

References 38 publications

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“…[ 4 ] Differing from widely adopted characterizations at room‐temperature (RT), more physical insights in the factors limiting the performance in PSCs can be gained with detailed temperature ( T )‐dependent studies. To date, our fundamental knowledge on how PSCs behave with varied T is still incomplete, [ 5–11 ] which impedes realistic application of PSCs in a T ‐variable environment.…”

Section: Introductionmentioning

confidence: 99%

“…So far, there have been a handful of investigations focused on these perspectives with observing positive T ‐dependencies of PCEs based on prototype methylammonium lead triiodide (MAPbI 3 ) perovskites. [ 6–9 ] The efficiency losses at lower T are mainly caused by the decreases of short‐current density ( J SC ) and fill factor (FF), resembling the tendencies in organic solar cells. [ 12,13 ] These T ‐behaviors have been ascribed to a couple of reasons including the slow diffusion of charge carriers in the device, [ 7 ] the phase transition and resultant incomplete dissociation of Wannier excitons in the MAPbI 3 film.…”

Section: Introductionmentioning

confidence: 99%

“…[ 6,8 ] The reduction of FF at lower T also can be directly caused by the occurrence of S‐shaped photocurrent, suffering from inefficient charge extraction (or CE) at defective interfaces and elevation of interfacial charge accumulation. [ 9,10 ] In order to tackle these obstacles, attempts have been made through utilizing charge transporting layers (CTL) with a higher electrical conductivity to enhance carrier extraction at the electrode interface, leading to the disappearance of detrimental S‐shaped kinks in photovoltaic current density‐voltage ( J–V ) characteristics. [ 10 ]…”

Section: Introductionmentioning

confidence: 99%

“…Although these studies have shed light on the T ‐behaviors in halide PSCs, it is noted that the reported T ‐variable trends in device parameters are heavily affected by the adopted device architecture, film quality (crystalline grain sizes or structural defects) or interfacial CTLs. [ 8–10 ] Moreover, in previous T ‐studies, the RT‐efficiencies of the concerned devices are considerably lower than state‐of‐the art PCEs based on the same perovskite photo‐absorbers, typically falling in the range of 13–16%. [ 6–11 ] This may lead to discrepancies in the observed T ‐coefficients of photovoltaic parameters in the literature, [ 6–10 ] which limits our understandings on the intrinsic factors limiting the device operation at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Understanding Temperature‐Dependent Charge Extraction and Trapping in Perovskite Solar Cells

Zhou

Wang

Meng

et al. 2020

Adv Funct Materials

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Understanding the factors that limit the performance of perovskite solar cells (PSCs) can be enriched by detailed temperature (T)-dependent studies. Based on p-i-n type PSCs with prototype methylammonium lead triiodide (MAPbI 3 ) perovskite absorbers, T-dependent photovoltaic properties are explored and negative T-coefficients for the three device parameters (V OC , J SC , and FF) are observed within a wide low T-range, leading to a maximum power conversion efficiency (PCE) of 21.4% with an impressive fill factor (FF) approaching 82% at 220 K. These T-behaviors are explained by the enhanced interfacial charge transfer, reduced charge trapping with suppressed nonradiative recombination and narrowed optical bandgap at lower T. By comparing the T-dependent device behaviors based on MAPbI 3 devices containing a PASP passivation layer, enhanced PCE at room temperature is observed but different tendencies showing attenuating T-dependencies of J SC and FF, which eventually leads to nearly T-invariable PCEs. These results indicate that charge extraction with the utilized all-organic charge transporting layers is not a limiting factor for low-T device operation, meanwhile the trap passivation layer of choice can play a role in the T-dependent photovoltaic properties and thus needs to be considered for PSCs operating in a temperature-variable environment.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Understanding Temperature‐Dependent Charge Extraction and Trapping in Perovskite Solar Cells

Zhou

Wang

Meng

et al. 2020

Adv Funct Materials

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show abstract

“…Compared with the conventional silicon-based solar cells, organic solar cells (OSCs) [1,2], as promising candidates for next generation solar cells [3][4][5][6], show many advantages in intensive researches, such as low temperature preparation [2], flexibility [7], and so on. However, as the important physical phenomena, S-shaped kink exhibits in I-V characteristics of OSCs, especially for the polymer OSCs [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

An Analytical Solution to Lumped Parameter Equivalent Circuit Model of Organic Solar Cells

Huang¹,

Yu²,

Xu³

2018

Crystals

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In this paper, an analytical and closed-form solution to the lumped parameter equivalent circuit model of organic solar cells is proposed to complete the simulations of the S-shaped I-V characteristics. Based on the model previously proposed by Mazhari, the set of terminal current and voltage equations describing the three diodes is solved and the effects from the model parameters are illustrated. Our solutions are verified by being compared with the least square method results and experimental data, respectively. Good agreements show that our solution calculation scheme is not only both accurate and efficient, but also valid in the whole operation regime of solar cells, especially for the S-shaped kink on the condition where the terminal voltage is larger than the open circuit voltage. Such an analytical solution can play an important role in the simulations for I-V characteristics of solar cells, fast extractions of the model parameters, and implements into practical photovoltaic device simulators.

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Ionic Accumulation as a Diagnostic Tool in Perovskite Solar Cells: Characterizing Band Alignment with Rapid Voltage Pulses

et al. 2023

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Despite record‐breaking devices, interfaces in perovskite solar cells are still poorly understood, inhibiting further progress. Their mixed ionic‐electronic nature results in compositional variations at the interfaces, depending on the history of externally applied biases. This makes it difficult to measure the band energy alignment of charge extraction layers accurately. As a result, the field often resorts to a trial‐and‐error process to optimize these interfaces. Current approaches are typically carried out in a vacuum and on incomplete cells, hence values may not reflect those found in working devices. To address this, a pulsed measurement technique characterizing the electrostatic potential energy drop across the perovskite layer in a functioning device is developed. This method reconstructs the current‐voltage (JV) curve for a range of stabilization biases, holding the ion distribution “static” during subsequent rapid voltage pulses. Two different regimes are observed: at low biases, the reconstructed JV curve is “s‐shaped”, whereas, at high biases, typical diode‐shaped curves are returned. Using drift‐diffusion simulations, it is demonstrated that the intersection of the two regimes reflects the band offsets at the interfaces. This approach effectively allows measurements of interfacial energy level alignment in a complete device under illumination and without the need for expensive vacuum equipment.

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Elucidating the evolution of the current-voltage characteristics of planar organometal halide perovskite solar cells to an S-shape at low temperature

Cited by 23 publications

References 38 publications

Understanding Temperature‐Dependent Charge Extraction and Trapping in Perovskite Solar Cells

Understanding Temperature‐Dependent Charge Extraction and Trapping in Perovskite Solar Cells

An Analytical Solution to Lumped Parameter Equivalent Circuit Model of Organic Solar Cells

Ionic Accumulation as a Diagnostic Tool in Perovskite Solar Cells: Characterizing Band Alignment with Rapid Voltage Pulses

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