Plasma‐enhanced modification of multiwalled carbon nanotube with conducting polymers for dye sensitized solar cells

Çoğal, Sadık; Ela, Sule Erten; Çoğal, Gamze Çelik; Mičušík, Matej; Omastová, Mária; Öksüz, Ayşegül Uygun

doi:10.1002/pc.23983

Cited by 10 publications

(1 citation statement)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure S6, all four samples show characteristic peaks of S 2p core levels with binding energies of S 2p 3/2 at ∼163.6 eV and S 2p 3/2 at ∼168.2 eV, which correspond to C–S in thiophene of P3HT and the presence of oxidized sulfur, respectively. Therefore, P3HT is present at the top surface for both architectures. − …”

Section: Results and Discussionmentioning

confidence: 99%

Device Architecture Study in Fullerene-Based Organic Photovoltaics

2020

View full text Add to dashboard Cite

The effect of device architecture on the performance of fullerene-based organic photovoltaic (OPV) devices has not been investigated so far. Here, we performed experimental and simulation studies on fullerenebased OPVs with conventional and inverted architectures to understand the contributions from photogeneration of carriers, carrier mobility, and vertical phase separation. Charge transfer from the active layer to the bottom transport layer was studied with surface photovoltage spectroscopy (SPS) measurements. Our results show that SPS signals and spectral shape depend strongly on donor concentration in the conventional architecture but not in the inverted architecture. Additionally, conventional OPV devices show better device current density−voltage performance than inverted devices, specifically producing higher short-circuit current density. Carrier generation alone cannot explain these results. X-ray photoelectron spectroscopy results show poly(3-hexylthiophene) (P3HT) enrichment on the air surface, which should have enhanced inverted device performance. Using a solar cell capacitor simulator, we studied the active layer thickness and carrier mobility effects and established the imbalance in carrier mobilities in these devices. This carrier mobility imbalance explains the architecture dependence in the SPS results, OPV device performance, and optimal active layer thickness, while total photogeneration rate and vertical phase separation predict results inconsistent with experimental observation.

show abstract