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Dion-Jacobson Type Lead-Free Double Perovskite with Ultra-Narrow Aromatic Interlayer Spacing for Highly Sensitive and Stable X-ray Detection
Small ( IF 13.0 ) Pub Date : 2024-03-08 , DOI: 10.1002/smll.202312281 Guirong Chen 1 , Hongliang Dai 1 , Zeng-Kui Zhu 1, 2 , Jianbo Wu 2 , Panpan Yu 1 , Ying Zeng 1 , Yingying Zheng 1 , Lijun Xu 2 , Junhua Luo 1, 2
Small ( IF 13.0 ) Pub Date : 2024-03-08 , DOI: 10.1002/smll.202312281 Guirong Chen 1 , Hongliang Dai 1 , Zeng-Kui Zhu 1, 2 , Jianbo Wu 2 , Panpan Yu 1 , Ying Zeng 1 , Yingying Zheng 1 , Lijun Xu 2 , Junhua Luo 1, 2
Affiliation
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The low-toxic and environmentally friendly 2D lead-free perovskite has made significant progress in the exploration of “green” X-ray detectors. However, the gap in detection performance between them and their lead-based analogues remains a matter of concern that cannot be ignored. To reduce this gap, shortening the interlayer spacing to accelerate the migration and collection of X-ray carriers is a promising strategy. Herein, a Dion-Jacobson (DJ) lead-free double perovskite (4-AP)2AgBiBr8 (1, 4-AP = 4-amidinopyridine) with an ultra-narrow interlayer spacing of 3.0 Å, is constructed by utilizing π-conjugated aromatic spacers. Strikingly, the subsequent enhanced carrier transport and increased crystal density lead to X-ray detectors based on bulk single crystals of 1 with a high sensitivity of 1117.3 µC Gy−1 cm−2, superior to the vast majority of similar double perovskites. In particular, the tight connection of the inorganic layers by the divalent cations enhances structural rigidity and stability, further endowing 1 detector with ultralow dark current drift (3.06 × 10−8 nA cm−1 s−1 V−1, 80 V), excellent multiple cycles switching X-ray irradiation stability, as well as long-term environmental stability (maintains over 94% photoresponse after 90 days). This work brings lead-free double perovskites one step closer to realizing efficient practical green applications.
中文翻译：
具有超窄芳香层间距的 Dion-Jacobson 型无铅双钙钛矿，可实现高灵敏度和稳定的 X 射线检测
低毒环保的二维无铅钙钛矿在“绿色”X射线探测器探索中取得重大进展。然而，它们与基于铅的类似物之间的检测性能差距仍然是一个不容忽视的问题。为了减少这种间隙，缩短层间距以加速X射线载流子的迁移和收集是一种有前景的策略。在此，利用 π- 构建了具有 3.0 Å 超窄层间距的 Dion-Jacobson (DJ) 无铅双钙钛矿 (4-AP) 2 AgBiBr 8 ( 1 , 4-AP = 4-amidinopyridine) 。共轭芳族间隔基。引人注目的是，随后增强的载流子传输和增加的晶体密度导致基于1的块状单晶的X射线探测器具有1117.3 µC Gy -1 cm -2的高灵敏度，优于绝大多数类似的双钙钛矿。特别是，无机层通过二价阳离子的紧密连接增强了结构刚性和稳定性，进一步赋予1个探测器超低暗电流漂移（3.06 × 10 -8 nA cm -1 s -1 V -1 , 80 V），优异的多循环切换X射线照射稳定性，以及长期环境稳定性（90天后保持94%以上的光响应）。这项工作使无铅双钙钛矿离实现高效的实际绿色应用又近了一步。
更新日期：2024-03-08
中文翻译：
具有超窄芳香层间距的 Dion-Jacobson 型无铅双钙钛矿，可实现高灵敏度和稳定的 X 射线检测
低毒环保的二维无铅钙钛矿在“绿色”X射线探测器探索中取得重大进展。然而，它们与基于铅的类似物之间的检测性能差距仍然是一个不容忽视的问题。为了减少这种间隙，缩短层间距以加速X射线载流子的迁移和收集是一种有前景的策略。在此，利用 π- 构建了具有 3.0 Å 超窄层间距的 Dion-Jacobson (DJ) 无铅双钙钛矿 (4-AP) 2 AgBiBr 8 ( 1 , 4-AP = 4-amidinopyridine) 。共轭芳族间隔基。引人注目的是，随后增强的载流子传输和增加的晶体密度导致基于1的块状单晶的X射线探测器具有1117.3 µC Gy -1 cm -2的高灵敏度，优于绝大多数类似的双钙钛矿。特别是，无机层通过二价阳离子的紧密连接增强了结构刚性和稳定性，进一步赋予1个探测器超低暗电流漂移（3.06 × 10 -8 nA cm -1 s -1 V -1 , 80 V），优异的多循环切换X射线照射稳定性，以及长期环境稳定性（90天后保持94%以上的光响应）。这项工作使无铅双钙钛矿离实现高效的实际绿色应用又近了一步。
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