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Optimization of Optoelectronic Devices by Interface Modification

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Optimization of Optoelectronic Devices by Interface Modification/ Yifang Qi.
Author:	Qi, Yifang,
Description:	1 electronic resource (98 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31842263
ISBN:	9798283435312

Optimization of Optoelectronic Devices by Interface Modification
Qi, Yifang,

Optimization of Optoelectronic Devices by Interface Modification [electronic resource] /Yifang Qi. - 1 electronic resource (98 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

Currently, the highest certified power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) has reached 26.7%, rivaling that of traditional commercial silicon solar cells. The PSCs are fabricated by spin coated method with low temperature, so the perovskite films has inherent defects that degrade its electrical properties, leading to an energy level mismatch between the absorption layer and the ETL/HTL. Here, this study aims to achieve high-efficiency and stable PSCs by addressing defects at the surface of perovskite films, the perovskite bulk, and interfaces, as well as stability issues. Various synergistic passivation and surface modification strategies were employed, and the impact of these strategies on the photovoltaic performance and stability of PSCs was elucidated through an in-depth study of the properties of functional layers and interfaces. The defect passivation mechanisms and performance enhancement principles were also revealed. Ultimately, this research achieved simultaneous improvements in both the photovoltaic performance and stability of PSCs. The main research contents and results are summarized as follows:(1) To enhance device stability, three dye materials based on ClO4⁻ groups were used to passivate the interface between ETL and the metal electrode. The Dye1, Dye2, and Dye3 passivation layers effectively suppress charge recombination in the devices. Additionally, the dye passivation layers improve transportation charge and reduce the trap density.(2) To address the issue of ion migration damaging the photostability of devices, tetrabutylammonium chloride (TBACl) was introduced into the interface between perovskite and ETL layers. The TBACl-modified PSCs exhibit a significant increase in PCE, with the champion device achieving a PCE of 20.01%, which is higher than the control device of 18.52%.(3) To investigate the interfacial influence between HTL and perovskite layers on the performance of PSCs, we synthesized three different polymers to passivate the interface between HTL and the perovskite layer. The incorporation of polymers as interfacial layers results in optimal energy level alignment, facilitating enhanced carrier extraction and transport between HTL and MAPbI3 layers.

English

ISBN: 9798283435312Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

Perovskite solar cells

Optimization of Optoelectronic Devices by Interface Modification
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520 # $a Currently, the highest certified power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) has reached 26.7%, rivaling that of traditional commercial silicon solar cells. The PSCs are fabricated by spin coated method with low temperature, so the perovskite films has inherent defects that degrade its electrical properties, leading to an energy level mismatch between the absorption layer and the ETL/HTL. Here, this study aims to achieve high-efficiency and stable PSCs by addressing defects at the surface of perovskite films, the perovskite bulk, and interfaces, as well as stability issues. Various synergistic passivation and surface modification strategies were employed, and the impact of these strategies on the photovoltaic performance and stability of PSCs was elucidated through an in-depth study of the properties of functional layers and interfaces. The defect passivation mechanisms and performance enhancement principles were also revealed. Ultimately, this research achieved simultaneous improvements in both the photovoltaic performance and stability of PSCs. The main research contents and results are summarized as follows:(1) To enhance device stability, three dye materials based on ClO4⁻ groups were used to passivate the interface between ETL and the metal electrode. The Dye1, Dye2, and Dye3 passivation layers effectively suppress charge recombination in the devices. Additionally, the dye passivation layers improve transportation charge and reduce the trap density.(2) To address the issue of ion migration damaging the photostability of devices, tetrabutylammonium chloride (TBACl) was introduced into the interface between perovskite and ETL layers. The TBACl-modified PSCs exhibit a significant increase in PCE, with the champion device achieving a PCE of 20.01%, which is higher than the control device of 18.52%.(3) To investigate the interfacial influence between HTL and perovskite layers on the performance of PSCs, we synthesized three different polymers to passivate the interface between HTL and the perovskite layer. The incorporation of polymers as interfacial layers results in optimal energy level alignment, facilitating enhanced carrier extraction and transport between HTL and MAPbI3 layers.
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