Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 3, Pages 2406-2415Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11692
Keywords
silicon nanotips; PEDOT:PSS; hybrid solar cells; low-pressure-assisted coating; chemical polishing etching
Funding
- Ministry of Science and Technology of Taiwan [MOST 104-2119-M-002-017, MOST 103-2221-E-002-132 -MY3, MOST 104-2221-E-002-139 -MY3, MOST 104-3113-E-002-010, MOST 104-3113-E-002-019, MOST 103-3113-E-002-011]
- National Taiwan University [NTU-CESRP-104R7607-1, NTU-ICRP-104R7558, NTU-CESRP-103R7607-1, NTU-ICRP-103R7558]
- [NSC 100-2221-E-002-158-MY3]
- [NSC 103-2623-E-002-015-ET]
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Nanostructured silicon hybrid solar cells are promising candidates for a new generation photovoltaics because of their light-trapping abilities and solution processes. However, the performance of hybrid organic/Si nanostructure solar cells is hindered because of carrier recombination at surface and poor coverage of organic material poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PE-DOT:PSS) on nanostructures. Here we demonstrate low-pressure-assisted coating method of PEDOT:PSS on surface modified silicon nanotips with broadband light-trapping characteristics to improve interface property and to achieve high-efficiency hybrid solar cells through a solution process. The approach enhances the effective minority-carrier lifetime and the coverage of PEDOT:PSS on the surface of nanostructures. Hybrid solar cells fabricated with surface-modified nanotips exhibit a high fill factor of 70.94%, short-circuit current density of 35.36 mA/cm(2), open-circuit voltage of 0.528 V, and power conversion efficiency of 13.36%. The high efficiency and the high fill factor are achieved because of conformal coating of PEDOT:PSS via a low-pressure-assisted coating process, excellent light harvesting without sacrificing the minority-carrier lifetime, and efficient charge separation/collection of photogenerated carriers.
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