Synergistic Interfacial Dipole and π-Conjugation Effects Enable Efficient Tin Perovskite Solar Cells

Feng Yang; Kun Wang; Yang Yang; Yali Chen; Ziyong Kang; Tianxiang Li; Riming Sun; Yu Tong; Hongqiang Wang

doi:10.1021/acs.nanolett.5c01498

Synergistic Interfacial Dipole and π-Conjugation Effects Enable Efficient Tin Perovskite Solar Cells

Feng Yang, Kun Wang, Yang Yang, Yali Chen, Ziyong Kang, Tianxiang Li, Riming Sun, Yu Tong, Hongqiang Wang

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

Abstract

Tin perovskites are considered promising candidates for realizing high-performance, lead-free perovskite solar cells (PSCs). Despite prominent progress made through bulk optimization, unsatisfactory interfaces between tin perovskite and charge transport layers are critical obstacles to boosting device performance. Herein, we address this issue by introducing piperazine dihydroiodide (PDI) and ferrocene (Fc) at the interface of tin perovskite/C₆₀ to synergistically improve the interfacial charge transport. Specifically, PD⁺ interacts with formamidinium ions (FA⁺) to form an interfacial dipole, and Fc establishes π-π conjugation with C₆₀. These effects significantly improve electron extraction at the tin perovskite/C₆₀ interface and reduce energy losses. As a result, the efficiency of tin PSCs is remarkably improved from 10.62% to 13.65%, accompanied by enhanced stability. This work highlights the importance of interfacial modulation in tin PSCs toward realizing efficient and eco-friendly perovskite photovoltaics.

Original language	English
Pages (from-to)	5957-5964
Number of pages	8
Journal	Nano Letters
Volume	25
Issue number	14
DOIs	https://doi.org/10.1021/acs.nanolett.5c01498
State	Published - 9 Apr 2025

Keywords

interfacial dipole
solar cells
synergistic effects
tin perovskites
π-conjugation

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title = "Synergistic Interfacial Dipole and π-Conjugation Effects Enable Efficient Tin Perovskite Solar Cells",

abstract = "Tin perovskites are considered promising candidates for realizing high-performance, lead-free perovskite solar cells (PSCs). Despite prominent progress made through bulk optimization, unsatisfactory interfaces between tin perovskite and charge transport layers are critical obstacles to boosting device performance. Herein, we address this issue by introducing piperazine dihydroiodide (PDI) and ferrocene (Fc) at the interface of tin perovskite/C60 to synergistically improve the interfacial charge transport. Specifically, PD+ interacts with formamidinium ions (FA+) to form an interfacial dipole, and Fc establishes π-π conjugation with C60. These effects significantly improve electron extraction at the tin perovskite/C60 interface and reduce energy losses. As a result, the efficiency of tin PSCs is remarkably improved from 10.62% to 13.65%, accompanied by enhanced stability. This work highlights the importance of interfacial modulation in tin PSCs toward realizing efficient and eco-friendly perovskite photovoltaics.",

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doi = "10.1021/acs.nanolett.5c01498",

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T1 - Synergistic Interfacial Dipole and π-Conjugation Effects Enable Efficient Tin Perovskite Solar Cells

AU - Yang, Feng

AU - Wang, Kun

AU - Yang, Yang

AU - Chen, Yali

AU - Kang, Ziyong

AU - Li, Tianxiang

AU - Sun, Riming

AU - Tong, Yu

AU - Wang, Hongqiang

PY - 2025/4/9

Y1 - 2025/4/9

N2 - Tin perovskites are considered promising candidates for realizing high-performance, lead-free perovskite solar cells (PSCs). Despite prominent progress made through bulk optimization, unsatisfactory interfaces between tin perovskite and charge transport layers are critical obstacles to boosting device performance. Herein, we address this issue by introducing piperazine dihydroiodide (PDI) and ferrocene (Fc) at the interface of tin perovskite/C60 to synergistically improve the interfacial charge transport. Specifically, PD+ interacts with formamidinium ions (FA+) to form an interfacial dipole, and Fc establishes π-π conjugation with C60. These effects significantly improve electron extraction at the tin perovskite/C60 interface and reduce energy losses. As a result, the efficiency of tin PSCs is remarkably improved from 10.62% to 13.65%, accompanied by enhanced stability. This work highlights the importance of interfacial modulation in tin PSCs toward realizing efficient and eco-friendly perovskite photovoltaics.

AB - Tin perovskites are considered promising candidates for realizing high-performance, lead-free perovskite solar cells (PSCs). Despite prominent progress made through bulk optimization, unsatisfactory interfaces between tin perovskite and charge transport layers are critical obstacles to boosting device performance. Herein, we address this issue by introducing piperazine dihydroiodide (PDI) and ferrocene (Fc) at the interface of tin perovskite/C60 to synergistically improve the interfacial charge transport. Specifically, PD+ interacts with formamidinium ions (FA+) to form an interfacial dipole, and Fc establishes π-π conjugation with C60. These effects significantly improve electron extraction at the tin perovskite/C60 interface and reduce energy losses. As a result, the efficiency of tin PSCs is remarkably improved from 10.62% to 13.65%, accompanied by enhanced stability. This work highlights the importance of interfacial modulation in tin PSCs toward realizing efficient and eco-friendly perovskite photovoltaics.

KW - interfacial dipole

KW - solar cells

KW - synergistic effects

KW - tin perovskites

KW - π-conjugation

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DO - 10.1021/acs.nanolett.5c01498

M3 - 文章

AN - SCOPUS:105002392956

SN - 1530-6984

VL - 25

SP - 5957

EP - 5964

JO - Nano Letters

JF - Nano Letters

IS - 14

ER -

Synergistic Interfacial Dipole and π-Conjugation Effects Enable Efficient Tin Perovskite Solar Cells

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Keywords

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