Exploiting Electrical Transients to Quantify Charge Loss in Solar Cells

Li, Yiming; Shi, Jinsong; Yu, Bin; Duan, Biwen; Wu, Jionghua; Li, Hongshi; Li, Dongmei; Luo, Yanhong; Wu, Haiming; Meng, Qingbo

doi:10.1016/j.joule.2019.12.016

Cited by 77 publications

(54 citation statements)

References 74 publications

(125 reference statements)

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“…The density of states (DOS) is further derived from the equation: DOS-(E ω ) = À V D /(eW)•ω/(KT)•dC/dω, where V D is the depletion potential of the measured device, e is the electron charge, W is the depletion width and K is the Boltzmann constant. [22] As shown in Figure 4e, the defects in these two perovskites have a Gaussian-type distribution with similar energy broadening. Apparently, the target CsPbI 3 exhibits a lower trapstate density, in agreement with SCLC results.…”

Section: Methodsmentioning

confidence: 79%

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI₃ toward Stable and Efficient Photovoltaics

et al. 2022

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Low‐dimensional (LD) perovskites can effectively passivate and stabilize 3D perovskites for high‐performance perovskite solar cells (PSCs). Regards CsPbI3‐based PSCs, the influence of high‐temperature annealing on the LD perovskite passivation effect has to be taken into account due to fact the black‐phase CsPbI3 crystallization requires high‐temperature treatment, however, which has been rarely concerned so far. Here, the thermal stability of LD perovskites based on three hydrophobic organic ammonium salts and their passivation effect toward CsPbI3 and the whole device performance, have been investigated. It is found that, phenyltrimethylammonium iodide (PTAI) and its corresponding LD perovskites exhibit excellent thermal stability. Further investigation reveals that PTAI‐based LD perovskites are mainly distributed at grain boundaries, which not only enhances the phase stability of CsPbI3 but also effectively suppresses non‐radiative recombination. As a consequence, the champion PSC device based on CsPbI3 exhibits a record efficiency of 21.0 % with high stability.

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Section: Methodsmentioning

confidence: 79%

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI₃ toward Stable and Efficient Photovoltaics

et al. 2022

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“…The higher photocarrier mobility, longer carrier lifetime, and lower trap density are favorable for reducing the charge carrier recombination rate and achieving higher J sc and FF. [ 15,52–54 ]…”

Section: Resultsmentioning

confidence: 99%

A Quinoxaline‐Based D–A Copolymer Donor Achieving 17.62% Efficiency of Organic Solar Cells

et al. 2021

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Side‐chain engineering has been an effective strategy in tuning electronic energy levels, intermolecular interaction, and aggregation morphology of organic photovoltaic materials, which is very important for improving the power conversion efficiency (PCE) of organic solar cells (OSCs). In this work, two D–A copolymers, PBQ5 and PBQ6, are designed and synthesized based on bithienyl‐benzodithiophene (BDTT) as the donor (D) unit, difluoroquinoxaline (DFQ) with different side chains as the acceptor (A) unit, and thiophene as the π‐bridges. PBQ6 with two alkyl‐substituted fluorothiophene side chains on the DFQ units possesses redshifted absorption, stronger intermolecular interaction, and higher hole mobility than PBQ5 with two alkyl side chains on the DFQ units. The blend film of the PBQ6 donor with the Y6 acceptor shows higher and balanced hole/electron mobilities, less charge carrier recombination, and more favorable aggregation morphology. Therefore, the OSC based on PBQ6:Y6 achieves a PCE as high as 17.62% with a high fill factor of 77.91%, which is significantly higher than the PCE (15.55%) of the PBQ5:Y6‐based OSC. The PCE of 17.62% is by far one of the highest efficiencies for the binary OSCs with polymer donor and Y6 acceptor.

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“…Furthermore, the charge loss of our CsPb 1−x Ge x I 3 -based PSCs while working has been quantitatively evaluated by modulated electrical transient technique. [23] Transient photocurrents under 0 or 0.9 V bias voltage are given in Figure 4h. We can see that, the two devices based on CsPb 0.95 Ge 0.05 I 3 and CsPbI 3 exhibit different photocurrent decay behaviors, and non-radiative recombination occurs at a higher bias voltage.…”

Section: Resultsmentioning

confidence: 99%

Ge Incorporation to Stabilize Efficient Inorganic CsPbI₃ Perovskite Solar Cells

Meng

Zhang

et al. 2022

Advanced Energy Materials

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extensively researched from the material to the device in the past few years; however, the power conversion efficiency (PCE) of CsPbI 3 -based solar cells still lags behind hybrid perovskite solar cells (PSCs) as well as its maximum theoretical PCE. [2] Currently, the application of CsPbI 3 in PSCs is mainly perplexed by unsatisfied CsPbI 3 film quality, including black-phase stability, defects, and crystallinity. [3] Particularly, the black-phase CsPbI 3 is moisture-induced phase instability, that is, the moisture could easily result in phase transition from black phase into unfavorable yellow non-perovskite phase at room temperature. [4] Therefore, a big challenge is stabilizing high-quality black-phase CsPbI 3 films for efficient devices.Generally, the CsPbI 3 black-phase instability is mainly due to its lower tolerance factor, that is, the small size of the Cs + could not sustain PbI 6 octahedra in the cubic α-CsPbI 3 structure, easily leading to the δ-CsPbI 3 transformation. [3,4] To stabilize the black phase of CsPbI 3 films, different methods have been attempted, such as bromide partial iodide substitution to give the CsPbI 2 Br or CsPbIBr 2 , reducing crystal sizes or introducing intermediate phases in some degree. [5] Furthermore, controllable alien element doping into CsPbI 3 films (i.e., Ca 2+ , Sn 2+ , Ge 2+ , Sr 2+ , Mn 2+ , In 3+ , Bi 3+ , etc.) could increase the tolerance factor of the CsPbI 3 in some degree. [6,7] Typically, the replacement of PbI 2 with DMAPbI 3 (HPbI 3 ) as the Pb 2+ resource has directly promoted the PCE to ≈20% along with modifying crystallinity process or introducing surface passivation. [8] Even so, severe non-radiative recombination of the CsPbI 3 is still detrimental to the cell performance and opencircuit voltage (V oc ), in the meantime, the stability of CsPbI 3 perovskite solar cells has not been fully solved yet. [1,9] In addition, unlike hybrid perovskites, post-treatment toward passivating and stabilizing the CsPbI 3 films by in situ introducing low-dimensional perovskites, has not worked well sometimes, especially for the DMAPbI 3 system. [2c,10] Obviously, it is urgent to explore effective strategies to modify CsPbI 3 perovskite crystal growth, passivate defects, and improve the anti-humidity ability of inorganic perovskite solar cells.In current work, Ge element has been firstly incorporated into CsPbI 3 perovskite solar cells based on DMAPbI 3 -based precursor systems. Our investigation reveals that Ge incorporation can modify crystallization growth of CsPb 1−x Ge x I 3 films, Aiming at stable CsPbI 3 perovskite solar cells, Ge incorporated for the first time into DMAPbI 3 -based precursor systems. Ge incorporation is found to be able to modify crystallization growth of CsPb 1−x Ge x I 3 films and reduce annealing temperature and treatment time by lowering CsPbI 3 formation energy. The champion power conversion efficiency (PCE) of 19.52% is achieved with a certified PCE of 18.8%, which is the highest performance of CsPbI 3 PSCs with alien element-dopin...

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Exploiting Electrical Transients to Quantify Charge Loss in Solar Cells

Cited by 77 publications

References 74 publications

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI₃ toward Stable and Efficient Photovoltaics

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI₃ toward Stable and Efficient Photovoltaics

A Quinoxaline‐Based D–A Copolymer Donor Achieving 17.62% Efficiency of Organic Solar Cells

Ge Incorporation to Stabilize Efficient Inorganic CsPbI₃ Perovskite Solar Cells

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Exploiting Electrical Transients to Quantify Charge Loss in Solar Cells

Cited by 77 publications

References 74 publications

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI3 toward Stable and Efficient Photovoltaics

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI3 toward Stable and Efficient Photovoltaics

A Quinoxaline‐Based D–A Copolymer Donor Achieving 17.62% Efficiency of Organic Solar Cells

Ge Incorporation to Stabilize Efficient Inorganic CsPbI3 Perovskite Solar Cells

Contact Info

Product

Resources

About

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI₃ toward Stable and Efficient Photovoltaics

Temperature‐Reliable Low‐Dimensional Perovskites Passivated Black‐Phase CsPbI₃ toward Stable and Efficient Photovoltaics

Ge Incorporation to Stabilize Efficient Inorganic CsPbI₃ Perovskite Solar Cells