Tenghooi Goh

Yale University | YU · Department of Chemical & Environmental Engineering

Thanks to the bulk-heterojunction (BHJ) feature of polymer solar cells (PSC), additional light active components can be added with ease to form ternary solar cells. This strategy has achieved great success largely to expand the spectral response range to improve power conversion efficiency (PCE) without incurring excessive processing costs. Here, w...

There is currently enormous interest in the development of small molecule organic solar cells (SMSC), as in principle, these systems offer advantages over both conventional Si photovoltaics and organic polymer solar cells. Here, we report Forster Resonance Energy Transfer (FRET) enhanced inverted SMSC fabricated by coevaporating two different squar...

There are two crucial tasks for realizing high-efficiency polymer solar cells (PSCs): increasing the range of the spectral absorption of light and efficiently harvesting photogenerated excitons. Here, we describe Förster resonance energy transfer-based heterojunction polymer solar cells that incorporate squaraine dye. The high absorbance of squarai...

Electron acceptor degradation of organic solar cells is considered a main contributor to performance instability and a barrier for the commercialization of organic solar cells. Here, we selectively remove the electron acceptors on the surface of donor:acceptor blend films using a tape stripping technique. The near edge X-ray absorption fine structu...

The successful commercialization of perovskite solar cells (Pvs-SCs) calls for the need to find low-temperature processable interlayers with outstanding charge-transport features. In this work, we strategically blend poly(2-ethyl-2-oxazoline) (PEOz) with PEDOT:PSS as the modified hole transport layer (HTL) to achieve high efficiency P-I-N CH3NH3PbI...

In article number 1700144, Yifan Zheng, Junsheng Yu and co‐workers demonstrate a high efficiency polymer solar cell (PSC) through introducing a novel binary solvent additive combination of DPE:DIO (diphenyl ether und 1,8‐diiodoctane). This binary solvent additive system of DPE:DIO combines the influence of DIO on the PC70BM dispersion together with...

In this work, a 9.5% of power conversion efficiency (PCE) is obtained in the thieno [3,4-b] thiophene/benzodithiophene (PTB7): (6,6)-phenyl-C70-butyric acid methyl ester (PC70BM) based polymer solar cell (PSC) by using a novel binary solvent additive of diphenyl ether (DPE): 1,8-diiodoctane (DIO). We find that this binary solvent additive approach...

Controlling the morphology of the MAPbI3−xClx active layer has remained a challenge towards advancing perovskite solar cells (PvSCs). Here, we demonstrate that a low temperature additive dripping (AD) treatment step, using diphenyl ether (DPE), can significantly improve the power conversion efficiency (PCE), compared to the control device using chl...

Over the past decade, there has been significant improvement in the performance of polymer solar cells (PSCs). Devices with power conversion efficiency (PCE) well over 10% have been developed and in some cases the estimated device lifetime is approaching 10 years. In contrast, there has been limited research into the aesthetics of PSCs, which may b...

Despite being the most commonly used hole transport layer for p-i-n perovskite solar cells, the conventional PEDOT:PSS layer is far from being optimal for the best photovoltaic performance. Herein, we demonstrate highly conductive thin DMSO-doped PEDOT:PSS layers which significantly enhance the light harvesting, charge extraction, and photocurrent...

The incorporation of multiple donors into the bulk-heterojunction layer of organic polymer solar cells (PSCs) has been demonstrated as a practical and elegant strategy to improve photovoltaics performance. However, it is challenging to successfully design and blend multiple donors, while minimizing unfavorable interactions (e.g., morphological trap...

The development of thick organic photovoltaics (OPV) could increase absorption in the active layer and ease manufacturing constraints in large-scale solar panel production. However, the efficiencies of most low-bandgap OPVs decrease substantially when the active layers exceed ~ 100 nm (due to low crystallinity and short exciton diffusion length). H...

Fully integrated transparent devices require versatile architectures for energy storage, yet typical battery electrodes are thick (20-100 μm) and composed of optically absorbent materials. Reducing the length scale of active materials, assembling them with a controllable method and minimizing electrode thickness should bring transparent batteries c...

Controlling the mesoscale geometric configuration of catalysts on the oxygen electrode is an effective strategy to achieve high reversibility and efficiency in Li-O2 batteries. Here we introduce a new Li-O2 cell architecture that employs a catalytic polymer-based membrane between the oxygen electrode and the separator. The catalytic membrane was pr...

Power loss due to parasitic resistance limits the scale-up of nanocarbon/Si solar cells and, here, a viable approach that mitigates this problem is reported. The direct solution casting of silver nanowires (AgNWs) onto the single-walled nanotube (SWNT)/silicon junctions leads to a significant improvement in photovoltaic properties owing to enhanced...

Expanding the spectral absorption breadth and efficiently harvesting excitons are crucial towards creating highly efficient polymer solar cells. Here we describe a strategy to realize broad-band light harvesting in poly(3-hexylthiophene) (P3HT)-based solar cells. We introduce the use of squaraine dye molecules that play a dual role towards improvin...

Smooth and aligned single walled carbon nanotube (SWNT) thin films with improved optoelectronic performance are fabricated using a superacid slide casting method. Deposition of as made SWNT thin film on silicon (Si) together with post treatments result in SWNT/Si hybrid solar cells with unprecedented high fill factor of 73.8%, low ideality factor o...

Highly selective enrichment of (6,5) and (8,3) SWCNTs (above 85% of the semiconducting tubes) was achieved through multistep extraction by sodium dodecyl sulfate (SDS) and sodium cholate (SC) cosurfactant solution from narrowly (n,m) distributed SWCNTs produced by the catalyst Co-MCM-41. A systematic change in the chirality selectivity was observed...