Evaluation of dominant loss mechanisms of PERC cells for optimization of rear passivating stacks

Sadhukhan, Sourav; Acharyya, S. Chakraborty A.; Panda, Tamalika; Mandal, Nabin Chandra; Bose, Sukanta; Nandi, Anupam; Das, Gourab; Maity, Santanu; Chaudhuri, Phalguni; Chakraborty, Susanta Kumar; Saha, Hiranmay

doi:10.1016/j.surfin.2021.101496

“…Further, increase in W Al results in the decrease of J sc . This is because (1) the IR part of the incident spectrum is absorbed by metal without contributing to optical generation and the optical generation near the passivation region is higher than metal contact region [ 29 ] and (2) losses of minority electrons at metal/semiconductor interface due to Shockley–Read–Hall (SRH) recombination [ 30 ] without contributing to the total current. Again decrease of W Al results in a rapid decrease of J sc due to carrier crowding at metal contacts.…”

Section: Resultsmentioning

confidence: 99%

TOPerc Solar Cell: An Integral Approach of Tunnel Oxide Passivated Contact (TOPCon) and Passivated Emitter and Rear Contact (PERC) Architectures for Achieving Efficiency Beyond 25%

Sadhukhan

¹

,

Acharyya

²

,

Panda

³

et al. 2023

Energy Tech

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Passivated emitter and rear contact (PERC) on p‐type mono silicon has a roadmap for achieving >24% efficiency. The decrease of the full‐area rear metal contact to partial rear contact (<10%) accounts for the majority of the increase in efficiency of PERC solar cells over Al‐BSF solar cellswhich reached its maximum efficiency around 19.5%. P‐type tunnel oxide passivated contacts (TOPCon) solar cells have achieved further improvement in efficiency ≥25% by completely removing the partial rear metal contact and introducing a thin tunneling oxide layer at the rear. Thus passivating the partial rear and front metal contacts using SiOx/poly‐Si tunnelling layer stacks and an AlOx/SiNx stack on the entire back surface to passivate the remaining areas might lead to further advancements in PERC solar cells. Therefore, by integrating TOPCon and PERC architectures, as originally proposed by Fraunhofer lab, a modified design known as TOPerc solar cell has been studied in depth in this paper. Using 3D Sentaurus TCAD simulation software, a thorough numerical simulation of a p‐TOPerc solar cell has been performed. It is shown that efficiency of 25.2% and 26.0% is obtained for a p‐type wafer of bulk lifetime of 400 μs and 5.0 ms, respectively.

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“…[11] A negative vacuum level change can create potential wells, capturing carriers and leading to detrimental charge accumulation. Simultaneously, akin to the tunnel effect employed in tunnel oxide passivation contact (TOPCon) solar cells, [12,13] instead of elevating the series resistance in PSCs, [14,15] the introduction of a thin insulating layer at the perovskite/HTL interface facilitates the flow of charge carriers through potential barriers in the device structure. Among the numerous other strategies, including perovskite component engineering, [16,17] solvent engineering, [18] additive engineering, [20] and interface engineering, [21][22][23] this inserted thin insulating layer with an appropriate thickness can increase the open-circuit voltage (Voc) without significantly compromising the fill factor (FF).…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Polyimide Tunneling Layer for Efficient and Stable Perovskite Photovoltaics

Liu,

Yu,

Li

et al. 2024

Angew Chem Int Ed

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Despite the remarkable progress of perovskite solar cells (PSCs), challenges remain in terms of finding effective and viable strategies to enhance their long‐term stability while maintaining high efficiency. In this study, a new insulating and hydrophobic fluorinated polyimide (FPI: 6FDA‐6FAPB) was used as the interface layer between the perovskite layer and the hole transport layer (HTL) in PSCs. The functional groups of FPI play a pivotal role in passivating interface defects within the device. Due to its high work function, FPI demonstrates field‐effect passivation (FEP) capabilities as an interface layer, effectively mitigating non‐radiative recombination at the interface. Notably, the FPI insulating interface layer does not impede carrier transmission at the interface, which is attributed to the presence of hole tunneling effects. The optimized PSCs achieve an outstanding power conversion efficiency (PCE) of 24.61% and demonstrate excellent stability, showcasing the efficacy of FPI in enhancing device performance and reliability.

show abstract

“…[11] A negative vacuum level change can create potential wells, capturing carriers and leading to detrimental charge accumulation. Simultaneously, akin to the tunnel effect employed in tunnel oxide passivation contact (TOPCon) solar cells, [12,13] instead of elevating the series resistance in PSCs, [14,15] the introduction of a thin insulating layer at the perovskite/HTL interface facilitates the flow of charge carriers through potential barriers in the device structure. Among the numerous other strategies, including perovskite component engineering, [16,17] solvent engineering, [18] additive engineering, [20] and interface engineering, [21][22][23] this inserted thin insulating layer with an appropriate thickness can increase the open-circuit voltage (Voc) without significantly compromising the fill factor (FF).…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Polyimide Tunneling Layer for Efficient and Stable Perovskite Photovoltaics

Liu,

Yu,

Li

et al. 2024

Angewandte Chemie

3

0

View full text Add to dashboard Cite

Despite the remarkable progress of perovskite solar cells (PSCs), challenges remain in terms of finding effective and viable strategies to enhance their long‐term stability while maintaining high efficiency. In this study, a new insulating and hydrophobic fluorinated polyimide (FPI: 6FDA‐6FAPB) was used as the interface layer between the perovskite layer and the hole transport layer (HTL) in PSCs. The functional groups of FPI play a pivotal role in passivating interface defects within the device. Due to its high work function, FPI demonstrates field‐effect passivation (FEP) capabilities as an interface layer, effectively mitigating non‐radiative recombination at the interface. Notably, the FPI insulating interface layer does not impede carrier transmission at the interface, which is attributed to the presence of hole tunneling effects. The optimized PSCs achieve an outstanding power conversion efficiency (PCE) of 24.61% and demonstrate excellent stability, showcasing the efficacy of FPI in enhancing device performance and reliability.

show abstract

Evaluation of dominant loss mechanisms of PERC cells for optimization of rear passivating stacks

Cited by 4 publications

References 43 publications

TOPerc Solar Cell: An Integral Approach of Tunnel Oxide Passivated Contact (TOPCon) and Passivated Emitter and Rear Contact (PERC) Architectures for Achieving Efficiency Beyond 25%

TOPerc Solar Cell: An Integral Approach of Tunnel Oxide Passivated Contact (TOPCon) and Passivated Emitter and Rear Contact (PERC) Architectures for Achieving Efficiency Beyond 25%

Fluorinated Polyimide Tunneling Layer for Efficient and Stable Perovskite Photovoltaics

Fluorinated Polyimide Tunneling Layer for Efficient and Stable Perovskite Photovoltaics

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