Abstract
In this work, the effects of the SiOx interface layer grown by exposure in air on the performance of planar hybrid n-Si/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solar cells are investigated. Compared to the cell with a hydrogen-terminated Si surface, the cell with an oxygen-terminated Si surface reveals improved characteristics in power conversion efficiency, increased from 10.44% to 13.31%. By introducing the SiOx, the wettability of the Si surface can be improved, allowing an effective spread of the PEDOT:PSS solution and thus a good contact between the PEDOT:PSS film and Si. More importantly, it can change the polarity of the Si surface from a negative dipole to a positive dipole, owing to the introduction of the SiOx interface. The Si energy band will bend up and give rise to a favorable band alignment between Si and PEDOT:PSS to promote carrier separation. These results could be potentially employed to further development of this simple, low-cost heterojunction solar cell.
Highlights
Si/organic hybrid solar cells utilizing poly(3,4-ethylenedioxythiophene):poly(PEDOT:PSS) combined with an n-type silicon (n-Si) have attracted significant research interest in recent years due to their obvious advantages of a low-temperature process, remarkably low fabrication cost, and potential high efficiency [1]
Over the past few years, considerable progress towards creating highly efficient hybrid n-Si/PEDOT:PSS solar cells has been achieved by adjusting major factors such as electrical conductivity, chemical affinity, and passivation on the device surface [3,4,5,6,7,8,9]
Pham et al presented adding functionalized graphene to the PEDOT:PSS solution based on Silicon nanowire (SiNW), and demonstrated an enhancement of photoelectric conversion efficiency (PCE)
Summary
Si/organic hybrid solar cells utilizing poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate). Despite significant extraction therecombination photon-generated carrier and suppress thecathode recombination of hole electrons efforts at the to improve solar cell performance, the highest power conversion (PCE) reported to date is still rear cathode [12]. To further improve the performance of the hybrid n-Si/PEDOT:PSS solar cells, the interface. Si substrate to air in a simple and controllable way so that the wanted thickness could be obtained Whether this oxide layer can effectively improve the interface x could be ,orwhether this layer can effectively improve the quality and enhance theobtained. Our results suggest promising strategies to of oxygen-terminated bonds helps to build a net positive surface dipole, which promotes carrier further exploit the efficiency potential for the simple, low-cost hybrid. Our results suggest promising strategies to further exploit the efficiency potential for the simple, low-cost hybrid Si/organic solar cells
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