Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.
Department of Chemistry, Faculty of Science, King Abdulaziz University , 21589 Jeddah, Saudi Arabia.
ACS Appl Mater Interfaces. 2017 Jan 18;9(2):1877-1884. doi: 10.1021/acsami.6b12536. Epub 2017 Jan 6.
Charge transfer between a conducting polymer-based counter electrode (CE) and a polysulfide (S/S) electrolyte mediator is a key limitation to improvements of solar energy conversion efficiency (ECE) in quantum-dot-sensitized solar cells (QDSCs). In this paper, 1,2-ethanedithiol (EDT) was doped into nanofibrous poly(3,4-ethylenedioxythiophene) (PEDOT NF) to overcome the charge transfer limitation between PEDOT NF and S/S. EDT not only helps to reduce the aggregation and thus enhance the linearization of the PEDOT chains but also changes the molecular conformation of the PEDOT chains from a benzoid to a quinoid structure. EDT-doped PEDOT NF-based CEs showed almost 3.7 times higher conductivity, better electrocatalytic activity, and improved compatibility with S/S in an aqueous electrolyte. As a result, the charge transfer resistance between the polymer-based CE and the S/S electrolyte was significantly reduced, resulting in over 3% ECE in QDSCs, more than double that of a bare PEDOT NF-based CE.
在量子点敏化太阳能电池 (QDSC) 中，聚电解质 (S/S) 电解质介体与基于导电聚合物的对电极 (CE) 之间的电荷转移是提高太阳能转换效率 (ECE) 的关键限制。在本文中，1,2-乙二硫醇 (EDT) 被掺杂到纳米纤维聚 (3,4-亚乙基二氧噻吩) (PEDOT NF) 中，以克服 PEDOT NF 和 S/S 之间的电荷转移限制。EDT 不仅有助于减少聚集，从而增强 PEDOT 链的线性化，而且还改变 PEDOT 链的分子构象，从苯并型变为醌型结构。基于 EDT 掺杂的 PEDOT NF 的 CE 表现出近 3.7 倍的更高电导率、更好的电催化活性，并且在水性电解质中与 S/S 具有更好的相容性。结果，聚合物基 CE 和 S/S 电解质之间的电荷转移电阻显著降低，导致 QDSC 的 ECE 超过 3%，是裸 PEDOT NF 基 CE 的两倍多。
