Aqoma, Havid Al Mubarok, Muhibullah Hadmojo, Wisnu Tantyo Lee, Eun-Hye Kim, Tae-Wook Ahn, Tae Kyu Oh, Seung-Hwan Jang, Sung-Yeon 2024-01-20T01:31:58Z 2024-01-20T01:31:58Z 2021-09-01 2017-05-17 0935-9648 https://pubs.kist.re.kr/handle/201004/122730 Colloidal-quantum-dot (CQD) photovoltaic devices are promising candidates for low-cost power sources owing to their low-temperature solution processability and bandgap tunability. A power conversion efficiency (PCE) of >10% is achieved for these devices; however, there are several remaining obstacles to their commercialization, including their high energy loss due to surface trap states and the complexity of the multiple-step CQD-layer-deposition process. Herein, high-efficiency photovoltaic devices prepared with CQD-ink using a phase-transfer-exchange (PTE) method are reported. Using CQD-ink, the fabrication of active layers by single-step coating and the suppression of surface trap states are achieved simultaneously. The CQD-ink photovoltaic devices achieve much higher PCEs (10.15% with a certified PCE of 9.61%) than the control devices (7.85%) owing to improved charge drift and diffusion. Notably, the CQD-ink devices show much lower energy loss than other reported high-efficiency CQD devices. This result reveals that the PTE method is an effective strategy for controlling trap states in CQDs. English WILEY-V C H VERLAG GMBH COLLOIDAL PBS NANOCRYSTALS LEAD HALIDE PEROVSKITES PROCESSED SOLAR-CELLS SUB-BANDGAP STATES THIN-FILMS PERFORMANCE SOLIDS PASSIVATION SURFACE LAYERS High-Efficiency Photovoltaic Devices using Trap-Controlled Quantum-Dot Ink prepared via Phase-Transfer Exchange Article 10.1002/adma.201605756 1 ADVANCED MATERIALS, v.29, no.19 ADVANCED MATERIALS 29 19 scie scopus 000401170600007 2-s2.0-85014591188 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article COLLOIDAL PBS NANOCRYSTALS LEAD HALIDE PEROVSKITES PROCESSED SOLAR-CELLS SUB-BANDGAP STATES THIN-FILMS PERFORMANCE SOLIDS PASSIVATION SURFACE LAYERS phase-transfer exchange quantum dots solar cells surface traps voltage loss