## 4 Conclusions  
Overall, it is clear that a well formed homogenous DAD interlayer serves to improve device performance by providing gains in FF and in V\({}_{\text{oc}}\). It was also determined that AuCl\({}_{3}\) improved the performance of the CNTGO film in the device with the DAD layer more than the improvement observed when the CNTGO layer is in isolation. As prepared DAD containing devices vastly underperformed as prepared devices with no interlayer but the devices approached parity and beyond with the application of AuCl\({}_{3}\).  
**Supplementary Materials:** The following are available online at [[http://www.mdpi.com/2076-3417/9/21/4721/s1](http://www.mdpi.com/2076-3417/9/21/4721/s1)]([http://www.mdpi.com/2076-3417/9/21/4721/s1](http://www.mdpi.com/2076-3417/9/21/4721/s1)). Figure S1. Effect of changing input power on photovoltaic properties in the silicon reference device and a CNT/Si device. The input power is a percentage of the optimal power of 100 mW cm\({}^{-2}\). Figure S2. Optical microscope images of DAD films spun from different solution volumes. The blue areas are the DAD films, the large white areas are gold grid lines, and the small white dots are air bubble holes in the film. The dark dots are burnt holes. Figure S3. SEM images of DAD films spun from different solution volumes. Figure S4. AFM height maps of DAD films spun from different solution volumes. Figure S5. AFM cross sectional line graphs and percentage height distribution plots of DAD films spun from different solution volumes. Figure S6. AFM height maps of DAD films spun at different speeds. Figure S7. Cross-sectional line graphs and height distribution plots for DAD films spun at different spin speeds. Figure S8 (**a**) UV/Visible spectra of DAD films on glass spun from 200 uL aliquots dropwise for a variety of spin speeds. (**b**) Peak-baseline absorbance difference vs. spin speed of DAD films on glass. Figure S9. UV/Vis spectra of 2500 rpm DAD films on glass before and after exposure to AuCl\({}_{3}\) used in the devices for doping of the CNT layer.  
**Author Contributions:** [PERSON] and [PERSON] carried out the investigations and undertook the data analysis. [PERSON] also undertook some data analysis. [PERSON] and [PERSON] conceptualized and supervised the project and were also responsible for funding acquisition. [PERSON] and [PERSON] were responsible for the writing--original draft preparation while all authors were involved in writing--review and editing.  
**Funding:** This research was funded by the AUSTRALIAN RESEARCH COUNCIL, grant number DP150101354 and DP16010301.  
**Acknowledgments:** [PERSON] acknowledges Flanders University for its financial support in the form of a Research Higher Degree Scholarship during his study in Australia. The support of the Australian Research Council Discovery Program (DP150101354 and DP160101301) is gratefully acknowledged. We acknowledge the use of the South Australian nodes of Microscopy Australia (formerly known as the Australian Microscopy & Microanalysis Research Facility) and the Australian National Fabrication Facility (ANFF) at Flanders University.  
**Conflicts of Interest:** The authors declare no conflict of interest.