Browsing by Author "Hsieh, Cheng-Ming"

Now showing 1 - 4 of 4

Effects of the additives n-propylammonium or n-butylammonium iodide on the performance of perovskite solar cells
(2017-01-01)
Hsieh, Cheng-Ming
;
Yu, Yen-Lin
;
Chen, Chih-Ping
;
Chuang, Shih-Ching
;
應用化學系
Organic-inorganic lead halide perovskite solar cells (PSCs) offer a promising low-cost manufactural solar technology as they are compatible with large-scale and low-temperature (< 100 degrees C) solution processes. Through the optimization of perovskite active layer and phenyl-C-61-butyric acid methyl ester (PC61BM) layer thickness, the normal cells showed 9.7% power conversion efficiency (PCE). Compared with the corresponding normal devices, we observed an improvement in PCE from 9.7% to 11.3% and 10.2% for the devices prepared using 1 vol% of C3H7NH3I and 1 vol% of C4H9NH3I as additives, respectively. Via analysis by ultraviolet-visible (UV-vis) spectroscopy, grazing incidence wide angle X-ray diffraction (GIWAXS), and field emission scanning electron microscopy (FE-SEM), we concluded that the morphological changes, absorption, and crystallinity of the perovskite films played an important role that influenced the performance of the PSC devices with various additives. The presence of 1% of C3H7NH3I or 1% of C4H9NH3I caused the CH3NH3PbI3-x Clx films to grow uniformly with high coverage and continuous phase, as well as with higher absorption; this enabled the corresponding devices to display improved performance.
Low-temperature, simple and efficient preparation of perovskite solar cells using Lewis bases urea and thiourea as additives: stimulating large grain growth and providing a PCE up to 18.8%
(2018-01-01)
Hsieh, Cheng-Ming
;
Liao, Yung-Sheng
;
Lin, Yan-Ru
;
Chen, Chih-Ping
;
Tsai, Cheng-Min
We demonstrated that two Lewis bases - urea and thiourea - acted as efficient additives for CH3NH3(MA)PbI3-xClx and MAPbI(3) perovskite solar cells (PSCs) and observed a significant increase in PCE for the MAPbI(3) devices in the presence of 1% urea with a remarkable PCE of 18.8% using an extremely low annealing temperature (85 degrees C).
Organic bulk heterojunction photovoltaics incorporating cyclopenteno[60]fullerene monoadducts as n-type materials display superior power conversion efficiency than with PC61BM
(1970-01-01)
Tseng, Po-Yen
;
Hsiao, Huan-Chang
;
Hsieh, Cheng-Ming
;
Wu, An-Ju
;
Chuang, Shih-Ching
Organic bulk heterojunction photovoltaics, merely incorporating monoadducts of cyclopenteno[60]fullerenes (CPFs) as n-type materials and P3HT as p-type materials, display superior power conversion efficiency up to 4.6 +/- 0.12%, superseding that with PC61BM/P3HT (3.8 +/- 0.20%) for ca. 20%, under AM 1.5G irradiation?primarily attributed to the lack of homo-conjugation on CPFs and their higher LUMO energy levels.
Palladium(II)-Catalyzed Mono- and Bis-alkenylation of N-Acetyl-2-aminobiaryls through Regioselective C-H Bond Activation
(2018-04-06)
Annamalai, Pratheepkumar
;
Hsu, Kou-Chi
;
Raju, Selvam
;
Hsiao, Huan-Chang
;
Chou, Chih-Wei
We developed palladium-catalyzed oxidative coupling of olefins with N-acyl 2-aminobiaryls through a sequence of ortho C-H bond activation/alkene insertion/reductive elimination. Furthermore, we controlled the selectivity of mono- and bis-alkenylation products with the solvent effect. The developed protocol was promising for a broad substrate scope ranging from activated olefins with a wide variety of functional groups to unactivated olefins.