Bordeaux INP, IMS, CNRS, UMR 5218, F-33400, Talence, France.
Université de Bordeaux, IMS, UMR 5218, F-33400, Talence, France.
ACS Appl Mater Interfaces. 2016 Apr 13;8(14):9262-7. doi: 10.1021/acsami.6b00356. Epub 2016 Mar 30.
We report here an original approach to dope the semiconducting polymer-metal interface in an inverted bulk-heterojunction (BHJ) organic solar cell. Solution-processed 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), is deposited on top of a P3HT:PC61BM layer before deposition of the top electrode. Doping of P3HT by F4-TCNQ occurs after thermally induced diffusion at 100 °C of the latter into the BHJ. Diffusion and doping are evidenced by XPS and UV-vis-NIR absorption. XPS highlights the decrease in Fluorine concentration on top of the BHJ after annealing. In the same time, a charge transfer band attributed to doping is observed in the UV-vis-NIR absorption spectrum. Inverted polymer solar cells using solution-processed F4-TCNQ exhibit power conversion efficiency of nearly 3.5% after annealing. This simple and efficient approach, together with the low annealing temperature required to allow diffusion and doping, leads to standard efficiency P3HT:PC61BM polymer solar cells, which are suitable for printing on plastic flexible substrate.
我们在这里报告了一种在倒置体异质结（BHJ）有机太阳能电池中掺杂半导体聚合物-金属界面的原始方法。在沉积顶部电极之前，将溶液处理的 2,3,5,6-四氟-7,7,8,8-四氰基对醌二甲烷（F4-TCNQ）沉积在 P3HT:PC61BM 层的顶部。在 100°C 下将后者热诱导扩散到 BHJ 中后，F4-TCNQ 对 P3HT 进行掺杂。XPS 和紫外可见近红外吸收证明了扩散和掺杂的发生。XPS 强调了退火后 BHJ 顶部氟浓度的降低。同时，在紫外可见近红外吸收光谱中观察到归因于掺杂的电荷转移带。使用溶液处理的 F4-TCNQ 的倒置聚合物太阳能电池在退火后表现出近 3.5%的功率转换效率。这种简单有效的方法，以及允许扩散和掺杂所需的低温退火，可获得适用于塑料柔性基板印刷的标准效率 P3HT:PC61BM 聚合物太阳能电池。
