I'm regularly using chipTAN with a stand-alone TAN generator (similar to [1], based on optical flicker-code) for a DKB account. No problems so far.

Deutsche bank uses PhotoTAN, which supports hardware TAN generators [2].

Some banks use different but similar TAN generators (e.g. SecurePlus [3]), and I also witnessed Postbank accounts operated with USB-based TAN generators [4] called "BestSign".

[1] https://www.voelkner.de/products/476429/REINER-SCT-tanJack-o...

[2] https://genostore.de/db/phototan-lesegeraet/92/phototan-lese...

[3] https://cb.kobilshop.com/secureplus-generator/1/secureplus-g... securePlus Generator

[4] https://www.seal-one.com/devices.en#DiVc3100KLink BestSign