@article{dong_liu_barange_lee_pardue_yi_yin_so_2019, title={Long-Wavelength Lead Sulfide Quantum Dots Sensing up to 2600 nm for Short-Wavelength Infrared Photodetectors}, volume={11}, ISSN={["1944-8252"]}, DOI={10.1021/acsami.9b16539}, abstractNote={Lead sulfide nanoparticles (PbS NPs) are used in the short wavelength infrared (SWIR) photodetectors because of their excellent photosensitivity, bandgap tunability, and solution processability. It has been a challenge to synthesize high quality PbS NPs with an absorption peak beyond 2000 nm. In this work, using PbS seed crystals with an absorption peak at 1960 nm, we report a successful synthesis of very large mono-dispersed PbS NPs having a diameter up to 16 nm by multiple injections. The resulting NPs have an absorption peak over 2500 nm with a small full-width-at-half-maximum (FWHM) of 24 meV. To demonstrate the applications of such large QDs, broadband heterojunction photodetectors are fabricated with the large PbS QDs of an absorption peak at 2100 nm. The resulting devices have an EQE of 25% (over 50% IQE) at 2100 nm corresponding to a responsivity of 0.385 A/W, and an EQE ~60% in the visible range.}, number={47}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Dong, Chen and Liu, Shuyi and Barange, Nilesh and Lee, Jaewoong and Pardue, Tyler and Yi, Xueping and Yin, Shichen and So, Franky}, year={2019}, month={Nov}, pages={44451–44457} }
 @article{peng_liu_fu_pan_chen_so_schanze_2016, title={Corrugated Organic Light Emitting Diodes Using Low T-g Electron Transporting Materials}, volume={8}, ISSN={["1944-8244"]}, DOI={10.1021/acsami.6b02669}, abstractNote={A corrugated organic light emitting diode (OLED) with enhanced light extraction is realized by incorporating a corrugated composite electron transport layer (ETL) consisting of two ETLs with different glass transition temperatures. The morphology of the corrugated structure is characterized with atomic force microscopy. The results show that the corrugation can be controlled by the layer thicknesses and annealing temperature. Compared with the control planar device, the corrugated OLED shows a more than 35% enhancement in current efficiency from 31 cd/A to 43 cd/A and a 20% enhancement in external quantum efficiency from 10% to 12% at 100 cd/m(2). In addition, the corrugated OLED also has a greatly improved operational stability. The LT90 lifetime of a device operated at 1000 cd/m(2) is improved greater than 100-fold in the corrugated OLED.}, number={25}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Peng, Cheng and Liu, Shuyi and Fu, Xiangyu and Pan, Zhenxing and Chen, Ying and So, Franky and Schanze, Kirk S.}, year={2016}, month={Jun}, pages={16192–16199} }
 @article{liu_peng_cruz_chen_so_2016, title={Degradation study of organic light-emitting diodes with solution-processed small molecule phosphorescent emitting layers}, volume={4}, ISSN={["2050-7534"]}, DOI={10.1039/c6tc02962k}, abstractNote={Charge injection and solvent impurities effects on degradation of solution-processed small molecule phosphorescent organic light-emitting diodes.}, number={37}, journal={JOURNAL OF MATERIALS CHEMISTRY C}, author={Liu, Shuyi and Peng, Cheng and Cruz, Alexandria and Chen, Ying and So, Franky}, year={2016}, month={Oct}, pages={8696–8703} }
 @article{ho_chen_liu_peng_zhao_so_2016, title={Interface Effect on Efficiency Loss in Organic Light Emitting Diodes with Solution Processed Emitting Layers}, volume={3}, ISSN={["2196-7350"]}, DOI={10.1002/admi.201600320}, abstractNote={The performance of multilayered OLEDs with a solution processed emitting layer (EML) is compared to that of counterparts with an evaporated EML and it is found that the interfacial energy changes at the EML and electron transport layer (ETL) interface is a key factor determining the device efficiency. From the results of exciplex photoluminescence emission at the EML/ETL interface and energetic disorder measurements, it is revealed that there is an energy shift in the solution processed EML along with a band tail broadening compared with the device with an evaporated EML, resulting in inefficient hole blocking at the EML/ETL interface and a decrease in device efficiency. Using an ETL with a deep highest occupied molecular orbital (HOMO) level can ameliorate this problem, resulting in a solution processed OLED with a high external quantum efficiency of 29%.}, number={19}, journal={ADVANCED MATERIALS INTERFACES}, author={Ho, Szuheng and Chen, Ying and Liu, Shuyi and Peng, Cheng and Zhao, Dewei and So, Franky}, year={2016}, month={Oct} }
 @article{liu_ho_so_2016, title={Novel patterning method for silver nanowire electrodes for thermal-evaporated organic light emitting diodes}, volume={8}, number={14}, journal={ACS Applied Materials & Interfaces}, author={Liu, S. Y. and Ho, S. H. and So, F.}, year={2016}, pages={9268–9274} }
 @article{luo_liu_barange_wang_so_2016, title={Perovskite solar cells on corrugated substrates with enhanced efficiency}, volume={12}, DOI={10.1002/smll.201670241}, abstractNote={On page 6346, F. So and co-workers fabricate organometallic halide perovskite solar cells on nanoscaled corrugated substrates using colloidal lithography followed by reactive ion etching. The results reveal that light absorption is enhanced, demonstrated by an increase in average power conversion efficiency from 8.7% for the planar devices to 13% for the corrugated devices.}, number={46}, journal={Small (Weinheim An Der Bergstrasse, Germany)}, author={Luo, Y. and Liu, S. Y. and Barange, N. and Wang, L. and So, Franky}, year={2016}, pages={6346–6352} }