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Investigation of bulk hybrid heterojunction solar cells based on Cu(In,Ga)Se2 nanocrystals.

Yen YT, Lin YK, Chang SH, Hong HF, Tuan HY, Chueh YL - Nanoscale Res Lett (2013)

Bottom Line: This work presents the systematic studies of bulk hybrid heterojunction solar cells based on Cu(In, Ga)Se2 (CIGS) nanocrystals (NCs) embedded in poly(3-hexylthiophene) matrix.The CIGS NCs of approximately 17 nm in diameter were homogeneously blended with P3HT layer to form an active layer of a photovoltaic device.The blend ratios of CIGS NCs to P3HT, solvent effects on thin film morphologies, interface between P3HT/CIGS NCs and post-production annealing of devices were investigated, and the best performance of photovoltaic devices was measured under AM 1.5 simulated solar illumination (100 mW/cm2).

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science & Engineering, National Tsing Hua University, No, 101, Sec, 2, Kuang-Fu Rd,, Hsinchu 30013, Taiwan. hytuan@che.nthu.edu.tw.

ABSTRACT
This work presents the systematic studies of bulk hybrid heterojunction solar cells based on Cu(In, Ga)Se2 (CIGS) nanocrystals (NCs) embedded in poly(3-hexylthiophene) matrix. The CIGS NCs of approximately 17 nm in diameter were homogeneously blended with P3HT layer to form an active layer of a photovoltaic device. The blend ratios of CIGS NCs to P3HT, solvent effects on thin film morphologies, interface between P3HT/CIGS NCs and post-production annealing of devices were investigated, and the best performance of photovoltaic devices was measured under AM 1.5 simulated solar illumination (100 mW/cm2).

No MeSH data available.


FTIR of CIGS NCs (a) and I-V characteristics of photovoltaic devices (b) with and without pyridine treatment. (a) CIGS NCs unrefluxed and refluxed by pyridine; (b) photovoltaic devices with and without pyridine treatment. (OLA, oleylamine; PYR, pyridine).
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Figure 5: FTIR of CIGS NCs (a) and I-V characteristics of photovoltaic devices (b) with and without pyridine treatment. (a) CIGS NCs unrefluxed and refluxed by pyridine; (b) photovoltaic devices with and without pyridine treatment. (OLA, oleylamine; PYR, pyridine).

Mentions: The crucial reason for the comparably poor performance of the hybrid solar cells might be due to carrier loss due to recombination on the surface of CIGS NCs. The surface of the as-synthesized CIGS NCs are end-capped with oleylamine as surfactant, which contains long alkyl chains with inherently dielectric properties, thus impeding a sufficient charge transport through the hybrid layer as well as charge separation at the interface between polymer/NCs [16]. Post treatment by pyridine-refluxed nanocrystals is a common way used for the reduction of interparticle distance thus enhancing the electrons/holes transported through the domain phases of nanocrystals [21]. Here, we employed the ligand exchange processes to substitute the oleylamine by the pyridine. A comparison of the FTIR transmission spectrum of the as-prepared and pyridine-treated CIGS NCs was characterized as shown in Figure 5a, and the corresponding I-V curves were measured as shown in Figure 5b for the hybrid solar cell before and after the pyridine treatment. Note that PV properties are highly related to the ligands capped onto surfaces of CIGS NCs. As a result, the Jsc increases after the pyridine treatment from 56 μA/cm2 to 69 μA/cm2 with the Voc of approximately 940 mV, yielding the enhanced power-conversion efficiency of approximately 0.017% with the fill factor of 0.26.The enhanced efficiency that pyridine-capped CIGS NCs enable more effective exciton dissociation at interfaces of P3HT/CIGS NCs compared with that of oleylamine-capped CIGS NCs.


Investigation of bulk hybrid heterojunction solar cells based on Cu(In,Ga)Se2 nanocrystals.

Yen YT, Lin YK, Chang SH, Hong HF, Tuan HY, Chueh YL - Nanoscale Res Lett (2013)

FTIR of CIGS NCs (a) and I-V characteristics of photovoltaic devices (b) with and without pyridine treatment. (a) CIGS NCs unrefluxed and refluxed by pyridine; (b) photovoltaic devices with and without pyridine treatment. (OLA, oleylamine; PYR, pyridine).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3733819&req=5

Figure 5: FTIR of CIGS NCs (a) and I-V characteristics of photovoltaic devices (b) with and without pyridine treatment. (a) CIGS NCs unrefluxed and refluxed by pyridine; (b) photovoltaic devices with and without pyridine treatment. (OLA, oleylamine; PYR, pyridine).
Mentions: The crucial reason for the comparably poor performance of the hybrid solar cells might be due to carrier loss due to recombination on the surface of CIGS NCs. The surface of the as-synthesized CIGS NCs are end-capped with oleylamine as surfactant, which contains long alkyl chains with inherently dielectric properties, thus impeding a sufficient charge transport through the hybrid layer as well as charge separation at the interface between polymer/NCs [16]. Post treatment by pyridine-refluxed nanocrystals is a common way used for the reduction of interparticle distance thus enhancing the electrons/holes transported through the domain phases of nanocrystals [21]. Here, we employed the ligand exchange processes to substitute the oleylamine by the pyridine. A comparison of the FTIR transmission spectrum of the as-prepared and pyridine-treated CIGS NCs was characterized as shown in Figure 5a, and the corresponding I-V curves were measured as shown in Figure 5b for the hybrid solar cell before and after the pyridine treatment. Note that PV properties are highly related to the ligands capped onto surfaces of CIGS NCs. As a result, the Jsc increases after the pyridine treatment from 56 μA/cm2 to 69 μA/cm2 with the Voc of approximately 940 mV, yielding the enhanced power-conversion efficiency of approximately 0.017% with the fill factor of 0.26.The enhanced efficiency that pyridine-capped CIGS NCs enable more effective exciton dissociation at interfaces of P3HT/CIGS NCs compared with that of oleylamine-capped CIGS NCs.

Bottom Line: This work presents the systematic studies of bulk hybrid heterojunction solar cells based on Cu(In, Ga)Se2 (CIGS) nanocrystals (NCs) embedded in poly(3-hexylthiophene) matrix.The CIGS NCs of approximately 17 nm in diameter were homogeneously blended with P3HT layer to form an active layer of a photovoltaic device.The blend ratios of CIGS NCs to P3HT, solvent effects on thin film morphologies, interface between P3HT/CIGS NCs and post-production annealing of devices were investigated, and the best performance of photovoltaic devices was measured under AM 1.5 simulated solar illumination (100 mW/cm2).

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science & Engineering, National Tsing Hua University, No, 101, Sec, 2, Kuang-Fu Rd,, Hsinchu 30013, Taiwan. hytuan@che.nthu.edu.tw.

ABSTRACT
This work presents the systematic studies of bulk hybrid heterojunction solar cells based on Cu(In, Ga)Se2 (CIGS) nanocrystals (NCs) embedded in poly(3-hexylthiophene) matrix. The CIGS NCs of approximately 17 nm in diameter were homogeneously blended with P3HT layer to form an active layer of a photovoltaic device. The blend ratios of CIGS NCs to P3HT, solvent effects on thin film morphologies, interface between P3HT/CIGS NCs and post-production annealing of devices were investigated, and the best performance of photovoltaic devices was measured under AM 1.5 simulated solar illumination (100 mW/cm2).

No MeSH data available.