Panchromatic NIR-Absorbing Sensitizers with a Thienopyrazine Auxiliary Acceptor for Dye-Sensitized Solar Cells
Panchromatic NIR-Absorbing Sensitizers with a Thienopyrazine Auxiliary Acceptor for Dye-Sensitized Solar Cells
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DOI：
10.1021/acsaem.3c00519
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发表时间：
2023-05
影响因子：
6.4
通讯作者：
William E. Meador;Nalaka P. Liyanage;Jonathon Watson;K. Groenhout;J. Delcamp
中科院分区：
文献类型：
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作者：
William E. Meador;Nalaka P. Liyanage;Jonathon Watson;K. Groenhout;J. Delcamp
染料敏化太阳能电池（DSC）是一种具有成本效益和高度可调的太阳能收集技术。目前的研究集中在近红外（NIR，>700 nm）吸收有机敏化剂的设计，以有效地收集低能光子，提高DSC的效率。本文合成了两种含前芳香噻吩并吡嗪（TPZ）辅助受体的近红外增感剂。研究了敏化剂的光学、电化学和器件性能。这两种染料探测TPZ辅助受体（A′）在π桥和受体（WM 1，D−π-A′−A）之间或在供体和π桥（WM 2，D-A′−π-A）之间的位置。WM 1和WM 2在二氯甲烷（DCM）中分别在631和604 nm处显示最大吸收。两种染料还具有较高的能量吸收特征，这有助于全色吸收到NIR区域。优化后的器件依次用Y123敏化以控制TPZ染料的表面构象，WM 1和WM 2分别产生20.3和14.4 mA/cm 2的高光电流值。WM 1在~ 900 nm处表现出低能近红外入射光电流效率（IPCE）。
Dye-sensitized solar cells (DSCs) are a cost-effective and highly tunable technology for harvesting solar energy. Current research is focused on the design of near-infrared (NIR, >700 nm) absorbing organic sensitizers to efficiently harvest low-energy photons to increase the efficiency of DSCs. Herein, two NIR sensitizers containing a proaromatic thienopyrazine (TPZ) auxiliary acceptor are synthesized. The optical, electrochemical, and device properties of the sensitizers were studied. The two dyes probe the placement of the TPZ auxiliary acceptor (A′) either between the π-bridge and the acceptor (WM1, D−π–A′−A) or between the donor and the π-bridge (WM2, D–A′−π–A).WM1andWM2exhibit absorption maxima at 631 and 604 nm in dichloromethane (DCM), respectively. Both dyes also have higher energy absorption features, which contributes to panchromatic absorption into the NIR region. Optimized devices were sequentially sensitized withY123to control the surface conformation of the TPZ dyes, yielding high photocurrent values of 20.3 and 14.4 mA/cm2forWM1andWM2, respectively.WM1exhibits a low-energy NIR incident photon-to-current efficiency (IPCE) onset at ∼900 nm.