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Substantial Improvement of Short Wavelength Response in n-SiNW/PEDOT:PSS Solar Cell.

Ge Z, Xu L, Cao Y, Wu T, Song H, Ma Z, Xu J, Chen K - Nanoscale Res Lett (2015)

Bottom Line: We fabricated more isolated silicon nanowires with the diluted etching solution.And the J sc of the hybrid solar cell with more isolated nanowires has a significant enhancement, from 30.1 to 33.2 mA/cm(2).The remarkable EQE in the wavelength region of 300 and 600 nm was also obtained, which are in excess of 80 %.

View Article: PubMed Central - PubMed

Affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures of National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

ABSTRACT
We report herein on the effects of silicon nanowire with different morphology on the device performance of n-SiNW/PEDOT:PSS hybrid solar cells. The power conversion efficiency (PCE) and external quantum efficiency (EQE) of the SiNW/PEDOT:PSS hybrid solar cells can be optimized by varying the length of the silicon nanowires. The optimal length of silicon nanowires is 0.23 μm, and the hybrid solar cell with the optimal length has the V oc of 569 mV, J sc of 30.1 mA/cm(2), and PCE of 9.3 %. We fabricated more isolated silicon nanowires with the diluted etching solution. And the J sc of the hybrid solar cell with more isolated nanowires has a significant enhancement, from 30.1 to 33.2 mA/cm(2). The remarkable EQE in the wavelength region of 300 and 600 nm was also obtained, which are in excess of 80 %. Our work provides a simple method to substantially improve the EQE of hybrid solar cell in the short wavelength region.

No MeSH data available.


The reflectance spectra of the silicon nanowire arrays (a) and the hybrid solar cells (b) with different L
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Fig4: The reflectance spectra of the silicon nanowire arrays (a) and the hybrid solar cells (b) with different L

Mentions: For our sample, the carriers generated by absorbing photon energies at the silicon nanowires diffuse to the bottom electrode and finally be collected. Hence, for longer silicon nanowires, the photon-generated carriers travel more distance before they were collected. This increases the probability of carrier recombination and therefore decreases the carrier collection efficiency of the solar cell. Besides, longer silicon nanowires have more surface area in comparison to the shorter one. We assume that the density of surface defects are the same, therefore, longer silicon nanowires have more surface defects. This will also increase the probability of carrier recombination. By contrast, the EQE spectra near the infrared region have not seen a significant change. We thought that it is mainly due to two facts: on the one hand, the longer SiNWs will have more light-trapping effect than the shorter SiNWs [22, 23]. The reflectance measurement does confirm this because the reflectance decreases with the wire’s length (as shown in Fig. 4a); on the other hand, for longer silicon nanowires with more surface area and more surface defects, carriers must diffuse and travel more distance through the silicon nanowire, therefore the fewer numbers of carrier were collected in comparison to that of shorter silicon nanowire [24]. Due to the decrease of both reflectance and the collection efficiency of carriers, the EQE spectra near the infrared region have no significant change with different lengths of SiNWs.Fig. 4


Substantial Improvement of Short Wavelength Response in n-SiNW/PEDOT:PSS Solar Cell.

Ge Z, Xu L, Cao Y, Wu T, Song H, Ma Z, Xu J, Chen K - Nanoscale Res Lett (2015)

The reflectance spectra of the silicon nanowire arrays (a) and the hybrid solar cells (b) with different L
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4539312&req=5

Fig4: The reflectance spectra of the silicon nanowire arrays (a) and the hybrid solar cells (b) with different L
Mentions: For our sample, the carriers generated by absorbing photon energies at the silicon nanowires diffuse to the bottom electrode and finally be collected. Hence, for longer silicon nanowires, the photon-generated carriers travel more distance before they were collected. This increases the probability of carrier recombination and therefore decreases the carrier collection efficiency of the solar cell. Besides, longer silicon nanowires have more surface area in comparison to the shorter one. We assume that the density of surface defects are the same, therefore, longer silicon nanowires have more surface defects. This will also increase the probability of carrier recombination. By contrast, the EQE spectra near the infrared region have not seen a significant change. We thought that it is mainly due to two facts: on the one hand, the longer SiNWs will have more light-trapping effect than the shorter SiNWs [22, 23]. The reflectance measurement does confirm this because the reflectance decreases with the wire’s length (as shown in Fig. 4a); on the other hand, for longer silicon nanowires with more surface area and more surface defects, carriers must diffuse and travel more distance through the silicon nanowire, therefore the fewer numbers of carrier were collected in comparison to that of shorter silicon nanowire [24]. Due to the decrease of both reflectance and the collection efficiency of carriers, the EQE spectra near the infrared region have no significant change with different lengths of SiNWs.Fig. 4

Bottom Line: We fabricated more isolated silicon nanowires with the diluted etching solution.And the J sc of the hybrid solar cell with more isolated nanowires has a significant enhancement, from 30.1 to 33.2 mA/cm(2).The remarkable EQE in the wavelength region of 300 and 600 nm was also obtained, which are in excess of 80 %.

View Article: PubMed Central - PubMed

Affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures of National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

ABSTRACT
We report herein on the effects of silicon nanowire with different morphology on the device performance of n-SiNW/PEDOT:PSS hybrid solar cells. The power conversion efficiency (PCE) and external quantum efficiency (EQE) of the SiNW/PEDOT:PSS hybrid solar cells can be optimized by varying the length of the silicon nanowires. The optimal length of silicon nanowires is 0.23 μm, and the hybrid solar cell with the optimal length has the V oc of 569 mV, J sc of 30.1 mA/cm(2), and PCE of 9.3 %. We fabricated more isolated silicon nanowires with the diluted etching solution. And the J sc of the hybrid solar cell with more isolated nanowires has a significant enhancement, from 30.1 to 33.2 mA/cm(2). The remarkable EQE in the wavelength region of 300 and 600 nm was also obtained, which are in excess of 80 %. Our work provides a simple method to substantially improve the EQE of hybrid solar cell in the short wavelength region.

No MeSH data available.