journal article·2019-02-12Open access

GeI2 Additive for High Optoelectronic Quality CsPbI3 Quantum Dots and Their Application in Photovoltaic Devices

Feng Liu, Chao Ding, Yaohong Zhang, Taichi Kamisaka, Qian Zhao, Joseph M. Luther, Taro Toyoda, Shuzi Hayase, Takashi Minemoto, Kenji Yoshino, Bing Zhang, Songyuan Dai, Junke Jiang, Shuxia Tao, Qing Shen

Chemistry of Materials· Volume 31· Issue 3

Abstract

Trioctylphosphine (TOP)-based syntheses of CsPbI3 perovskite quantum dots (QDs) yield unprecedented high photoluminescence quantum yield (PL QY), lower Stokes shifts, and longer carrier lifetimes due to their enhanced crystallinity. This synthetic route relies on a heavily Pb-rich condition or a large Pb:Cs molar ratio in precursor solution to produce QDs with appropriate stoichiometry as well as to guarantee a good colloidal stability. The high Pb condition is achieved by a high concentration of PbI2 prepared in TOP. Here we find such Pb-rich strategies can be avoided by providing additional iodine ions using other metal halide salts. In particular GeI2, which contrary to PbI2, readily dissolves in TOP. CsPbI3 QDs prepared using PbI2/GeI2 combination show near-unity PL QY and improved chemical stability compared to the previous synthetic route. Furthermore, we find no sign of Ge incorporation in the QDs (compositionally or energetically). The ensuing QD solar cells deliver power conversion efficiency of 12.15% and retain 85% of its peak performance after storage over 90 days. The PbI2/GeI2 dual-source iodine synthetic approach presented here represents a more rational and robust route to high-quality CsPbI3 QDs.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Faculty of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Tokyo 182-8585, Japan

National Renewable Energy Laboratory (NREL), 15013 Denver West Parkway, Golden, Colorado 80401, United States

College of Chemistry, Nankai University, Tianjin, P. R. China

Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Kitakyushu 808-0196, Japan

Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Shiga 525-8577, Japan

Department of Electrical and Electronic Engineering, Miyazaki University, 1-1 Gakuen, Miyazaki 889-2192, Japan

Beijing Key Laboratory of Novel Thin Film Solar Cells, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, P. R. China

Center for Computational Energy Research, Department of Applied Physics, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands

Funding

Ministry of Education, Culture, Sports, Science and Technology · Core Research for Evolutional Science and Technology · Precursory Research for Embryonic Science and Technology · Laboratory Directed Research and Development · Japan Society for the Promotion of Science · China Scholarship Council

References (58)

Show source-provided references
1. 10.1039/C8EE00754C10.1039/C8EE00754C ↗
2. 10.1126/science.aad584510.1126/science.aad5845 ↗
3. 10.1126/sciadv.150117010.1126/sciadv.1501170 ↗
4. 10.1021/jacs.8b0480310.1021/jacs.8b04803 ↗
5. 10.1021/acs.chemmater.6b0095410.1021/acs.chemmater.6b00954 ↗
6. 10.1038/ncomms905610.1038/ncomms9056 ↗
7. 10.1002/aenm.20150220210.1002/aenm.201502202 ↗
8. 10.1002/aenm.20180000710.1002/aenm.201800007 ↗
9. 10.1002/aenm.20170324610.1002/aenm.201703246 ↗
10. 10.1002/aenm.20150245810.1002/aenm.201502458 ↗
11. 10.1021/acs.chemmater.8b0123510.1021/acs.chemmater.8b01235 ↗
12. 10.1126/science.aag270010.1126/science.aag2700 ↗
13. 10.1038/s41563-018-0018-410.1038/s41563-018-0018-4 ↗
14. 10.1007/s12274-017-1685-110.1007/s12274-017-1685-1 ↗
15. 10.1021/nl504877910.1021/nl5048779 ↗
16. 10.1021/jacs.8b0605010.1021/jacs.8b06050 ↗
17. 10.1021/jacs.8b0594910.1021/jacs.8b05949 ↗
18. 10.1002/adma.20150256710.1002/adma.201502567 ↗
19. 10.1021/acsnano.5b0819310.1021/acsnano.5b08193 ↗
20. 10.1021/acsnano.6b0386310.1021/acsnano.6b03863 ↗
21. 10.1021/jacs.6b0890010.1021/jacs.6b08900 ↗
22. 10.1021/jacs.7b0140910.1021/jacs.7b01409 ↗
23. 10.1021/jacs.6b0808510.1021/jacs.6b08085 ↗
24. 10.1021/jacs.7b0862810.1021/jacs.7b08628 ↗
25. 10.1021/jacs.5b1347010.1021/jacs.5b13470 ↗
26. 10.1021/acs.chemmater.7b0280310.1021/acs.chemmater.7b02803 ↗
27. 10.1021/acs.chemmater.6b0484110.1021/acs.chemmater.6b04841 ↗
28. 10.1021/acsnano.7b0544210.1021/acsnano.7b05442 ↗
29. 10.1021/acs.nanolett.5b0240410.1021/acs.nanolett.5b02404 ↗
30. 10.1021/acsnano.8b0555510.1021/acsnano.8b05555 ↗
31. 10.1039/C6SC01758D10.1039/C6SC01758D ↗
32. 10.1021/jacs.5b0560210.1021/jacs.5b05602 ↗
33. 10.1021/acs.chemmater.8b0128310.1021/acs.chemmater.8b01283 ↗
34. 10.1021/acs.nanolett.5b0498110.1021/acs.nanolett.5b04981 ↗
35. 10.1021/acs.chemmater.7b0069210.1021/acs.chemmater.7b00692 ↗
36. 10.1021/jacs.7b1347710.1021/jacs.7b13477 ↗
37. 10.1021/acs.chemmater.7b0266910.1021/acs.chemmater.7b02669 ↗
38. 10.1021/acs.nanolett.8b0086110.1021/acs.nanolett.8b00861 ↗
39. 10.1139/v76-49310.1139/v76-493 ↗
40. 10.1021/cm051595610.1021/cm0515956 ↗
41. 10.1021/jacs.8b0498410.1021/jacs.8b04984 ↗
42. 10.1021/acsnano.5b0629510.1021/acsnano.5b06295 ↗
43. 10.1038/ncomms714210.1038/ncomms7142 ↗
44. 10.1021/jz500279b10.1021/jz500279b ↗
45. 10.1103/PhysRevB.86.15531310.1103/PhysRevB.86.155313 ↗
46. 10.1021/acsami.7b1467710.1021/acsami.7b14677 ↗
47. 10.1146/annurev.physchem.58.032806.10453710.1146/annurev.physchem.58.032806.104537 ↗
48. 10.1021/ja070099a10.1021/ja070099a ↗
49. 10.1021/acs.jpclett.7b0306210.1021/acs.jpclett.7b03062 ↗
50. 10.1021/acs.nanolett.5b0507710.1021/acs.nanolett.5b05077 ↗
51. 10.1021/acsnano.5b0732810.1021/acsnano.5b07328 ↗
52. 10.1021/acsnano.5b0458410.1021/acsnano.5b04584 ↗
53. 10.1038/srep2944210.1038/srep29442 ↗
54. 10.1126/sciadv.aao420410.1126/sciadv.aao4204 ↗
55. 10.1103/PhysRevB.62.261410.1103/PhysRevB.62.2614 ↗
56. 10.1103/PhysRevB.63.16531510.1103/PhysRevB.63.165315 ↗
57. 10.1002/anie.19690177110.1002/anie.196901771 ↗
58. 10.1038/nmat480010.1038/nmat4800 ↗